The sprawling living spaces inside these massive motorhomes are kitted out with everything you could possibly need to live a life of luxury out on the open road. From the "apocalypse-grade" RV built for an Australian outback adventure to the monster motorhomes of the Hollywood elite, the world's biggest RVs could convince even the most diehard homebody to set off on a freewheeling adventure.

Click or scroll through to explore eight of the largest land yachts and mobile mansions on the planet today...

*Prices are correct at the time of publication

Commissioned by a family of eight planning an epic adventure exploring Australia's remotest areas, this mammoth motorhome was built by Gold Coast firm SLRV Expedition Vehicles in 2017.

The luxury RV maker had a challenge on its hands creating an extra-large high-end motorhome that could cut it in the Australian outback, where the terrain can be treacherous and weather can range from blistering heat to dust storms and cyclones.

SLRV went all out and responded with an “apocalypse-grade” vehicle. The robust Commander 8x8 is built on a military-grade MAN TGS truck base, with walls up to five inches thick and durable double-glazed windows.

At 40 feet long, the Commander 8x8 ranks among the biggest RVs in the world. The vast motorhome runs on lithium batteries fuelled by solar panels and a diesel-powered backup generator and alternator. 

The Commander 8x8 may be as tough as nails but it doesn't scrimp on comfort. Ducted AC and heating make for the perfect temperature 24/7 and the lounge area has plush leather seating for up to 10 people.

The kitchen is loaded with appliances, including two fridges and two microwave ovens. As a bonus, the bathroom is spacious and has a full-sized shower supplied by tanks that can hold hundreds of gallons of water.

Like pretty much every other extra-large RV, the Commander 8x8 has its very own double bedroom, a five-star touch you just won't find in a smaller motorhome.

The cosy space is decked out with a widescreen TV, built-in storage and large picture windows. There are actually four TVs in the motorhome, which isn't short on amenities.

The pièce de résistance though has got to be the amazing lifting roof that can be raised at the push of a button to add an extra storey to the vehicle.

Accessed by a floating staircase, this level has six single beds and a large TV. Impressively, the RV can sleep 10 people in total as the seating downstairs can be converted into a double bed.

As you might have guessed, all this didn't come cheap, with the cost of this particular custom job estimated at between $670,000 (£528k) and $1.3 million (£1m).

The Ferrari of RVs, the eleMMent palazzo Superior from Austrian manufacturer Marchi Mobile is the last word in luxury road-tripping. And retailing at $2.1 million (£1.7m), it's among the priciest motorhomes in the world.

The most expensive on record, a $7.7 million (£6.1m) marvel from Germany's Volkner that comes with a Bugatti Chiron, is too small for this round-up. In contrast, the eleMMent palazzo Superior is an extraordinary 45 feet long and offers 732 square feet of living space.

Marchi Mobile got very creative with the exterior and drew on racing car, yacht and aviation designs to create the unique RV, which wows with a fishbowl-style cockpit.

Intended to showcase the views, the design features an ingenious adjustable sun protection system to block out unwanted rays.

Yacht-inspired porthole windows dot the sides of the futuristic-looking motorhome, which has thick, carbon-fibre walls for optimum insulation without adding much weight.

Checking out the interior, it's no surprise the millionaire motorhome has been described as a mansion on wheels. Going refreshingly against the traditional layout we see in motorhomes, the vehicle's living spaces look like they belong in a superyacht instead of a road vehicle.

The sumptuous living area has a 13-foot sofa, a jumbo TV screen, a well-stocked kitchen with an ice machine, parquet-style flooring, mood lighting and other deluxe touches.

Bedrooms on RVs don't get a whole lot grander than this stunning space. According to Marchi Mobile, the ornate king-sized bed is made by the same company that supplies beds to the British Royal Family and is considered the most comfortable in the world.

The adjacent spa bathroom is equally impressive, with a 16-square-foot glazed rainfall shower with a light therapy function and a sit-down vanity area for on-the-road pampering.

Like the Commander 8x8, the motorhome's most outstanding feature is its retractable roof. It can be instantly raised to conjure up a rooftop nightclub.

This glamorous Sky Lounge is a party-lover's dream, with a heated dancefloor, a covered seating area and a top-of-the-range Steinway Lyngdorf music system.

RVs that stretch to 50 feet long or more are few and far between. Among the small number of mega-sized motorhomes are a selection of superstar trailers that now live at the 7744 Ranch, a glamping park on the outskirts of Austin, Texas.

The collection includes Vin Diesel's former trailer, which is called The Aspen.

Spanning a whopping 53 feet in length, the monster trailer encompasses 1,200 square feet of living space. The Aspen, or Comfy Cabin as it was formerly known, has all the trappings of an A-list celebrity motorhome.

Anderson Mobile Estates, which owns the glamping park, built the trailer in the early 2000s for Vin Diesel and it appears he leased the model until the early 2010s. It reportedly travelled with him to movie sets in Puerto Rico for Fast and Furious, and Canada while the star was filming Riddick: Dead Man Stalking, as well as other locations around the world.

The RV has since undergone a makeover but retains its homely yet luxe vibe.

The living area is stylishly furnished with linen sofas, while this roomy office contains space to work as well as a putting green of all things. The interiors resemble a regular home rather than an RV, with little built-in seating and lots of freestanding furniture.

The Aspen has two bathrooms, including one with a large granite waterfall shower. Even some of the largest and most high-end motorhomes have only a single bathroom, so this is quite an unusual feature.

Vin Diesel's former trailer also contains a proper kitchen, with a full-sized oven and stove, a Viking fridge-freezer, microwave and other top-of-the-range appliances.

Then there's the highlight of this expertly crafted vehicle: the expandable hydraulic second floor, which can be raised in seconds.

The Hollywood action star had his master bedroom on the upper level and converted some of the floor space into a children's playroom, but this has since been repurposed as an additional sleeping area.

Valued at up to $2 million (£1.6m), the trailer is currently available to rent if you fancy holidaying like an A-lister.

Originally named Baby Girl, the Lux Lounge is Jennifer Lopez's former home on location – and it's quite something.

“One of the most modern and comfortable” RVs at the 7744 Ranch, the glam unit is the same size as the other monster motorhomes at the resort: 53 feet long, with 1,200 square feet of living space. Mirroring The Aspen, it's also valued at $2 million (£1.6m) and available to rent. 

The lounge on the first level can be used as a living area or screening room. A luxurious spot to unwind, it features an opulent black leather sofa, club chairs and other swish pieces of furniture.

It would've been the perfect place for the superstar to kick back, read up on a movie script or conduct a high-level meeting with Hollywood execs.

Though she probably has a private chef at hand, J.Lo loves to cook and she was very well-catered for with this trailer.

The lounge moves into a full-sized kitchen, which is equipped with a three-door Sub-Zero fridge-freezer, a two-burner cooktop, a convection microwave and a large sink.

There's also a marble bathroom elsewhere on this level with a walk-in glass shower.

As with The Aspen, J.Lo's former mansion on wheels rises at the touch of a button to create an upper level. 

Upstairs, you'll find a party lounge with just enough space for a mini dancefloor, an ideal spot to practice your dance moves. The space is also graced by two wide-screen TVs.

Among the standout features on the upper level are the sleek bar and the U-shaped leather sofa, which converts into a queen-sized bed. Mood lighting is inset into the ceiling, which features a unique, undulating surface design.

Intriguingly, The Lux Lounge was also leased to Mariah Carey, when it was dubbed the "Skyscraper on Wheels".   

The first monster trailer built by Anderson Mobile Estates, The Heat was created in the early 2000s and was first called The Studio. Will Smith fell in love with the humongous RV and had it customised to his exacting standards.

The tricked-out trailer is said to have cost $2.5 million (£2m). A revolutionary RV, The Heat was the first motorhome to feature a hydraulic expandable roof, as well as four slide-out segments.

Like its counterparts on the 7744 Ranch, the 53-foot-long motorhome has 1,200 square feet of living space.

With all that space and interiors that look like they belong in a superyacht, the Hollywood actor certainly didn't have to rough it while on location. Smith is said to have lived in the trailer while filming Ali, Men in Black III and The Pursuit of Happyness.

Divided by automatic doors that the designer dubs "Star Trek doors", the interiors seemingly go on and on. The first level is made up of a living area that includes a large chef's kitchen with $200,000 (£157k) granite countertops, couches covered in the finest Italian leather and exquisite custom wood cabinetry, including a table hand-crafted from Carpathian elm.

This floor also contains a makeup station and lounge area that Smith used as a wardrobe and dressing room. The bathroom is equally as opulent as the rest of the RV, with a sauna shower and a glass door that turns opaque at the push of a button.

As with the other models on the 7744 Ranch, the game-changing retractable upper level was made for entertaining.

Its hero feature is the drop-down 100-inch screen with automatic shades that transforms the space into a 30-person cinema, which was no doubt put to good use when Smith was in residence. In total, the trailer has an impressive 14 TVs.

There's a bedroom on the upper floor too, separated from the movie theatre by a sliding door, which features a queen-sized bed.

The 7744 Ranch also rents out The Studio, Simon Cowell's former RV. Anderson Mobile Estates has also created motorhomes for other world-famous VIPs, including Bill Clinton, Whitney Houston, Sharon Stone, Shakira and Sly Stallone.

Missouri-based SpaceCraft creates some of the longest, most beautifully decked-out trailers on the market. Established in 1962, it's the only company in the US to make fully customised fifth wheel, travel trailer and semi RV units. 

SpaceCraft allows its clientele extensive customisation options to create a space that's perfect for their needs, meaning each trailer made by the company is a one-off design.

As you can see in this custom design, the décor is simple and elegant, with a smart, traditional feel. Space is cleverly used and quality fixtures and fittings add to the high-spec finish. The living area flows well and is a cut above the sort of interior you'd expect to find in an RV. 

In this particular model, the sleek kitchen features beautiful dark cabinetry with gold-hued hardware and even a stunning marble-topped preparation island. 

SpaceCraft's larger models are popular choices for Hollywood types it would seem, as the company has provided models to the movie industry. This particular interior looks the part, just the sort of place for a star to relax in style between takes.

The flexibility to deck out each trailer to a buyer's specification is clearly a draw for the company's high-profile clients. 

The RV is powered by a diesel generator and there are built-in water tanks that can hold hundreds of gallons.

SpaceCraft is said to own a patent on its slide-out room design and its RVs make full use of this technology, which the company has perfected over the years.

This super-trailer was built as a green unit, with a roof covered in solar panels capable of generating around 10,000W of solar power. It also has a 108 kWh battery, so you could run the entire unit off the sun or charge an electric vehicle. 

Thanks to its sophisticated electrical systems and up-market finish, this 54-footer cost just over $800,000 (£630.4k).

Another SpaceCraft creation, this monster motorhome belongs to an elite group of super-large trailers and measures a massive 57 feet in length.

Hollywood celebrities aren't the only buyers of SpaceCraft's mega-trailers. Back in 1970, they responded to an increased demand for larger two-bedroom trailers by the circus and carnival industries. This impressive unit was designed for carnival use – it even has a rear office.

Kitchen amenities in typical models feature full-sized state-of-the-art appliances, including dishwashers. This design has a sleek double sink, a quartz-topped kitchen island, fully fitted units, a mosaic backsplash and striking pendulum lights.

The kitchen is part of an open-plan space that includes a dining table and chairs, as well as a living area with built-in units, wall-mounted wide-screen TV and some seriously comfy-looking leather recliners.

Clients can also opt for a myriad of niche add-ons such as custom mood lighting, an entertainment system, a gym and a makeup room.

The customers who ordered this sleek unit opted for a chic office space with built-in desks, stained walnut cupboards and glossy porcelain floor tiles, which run through most of the trailer.

According to SpaceCraft, they can do anything within the parameters of regulations, imagination, budget, and physics, so there's a plethora of bathroom design options – you could even design your very own mobile spa. 

This layout includes a spacious shower and decorative hand basin with another distinctive mosaic backsplash.

Clients can choose to have up to three king-size bedrooms in their bespoke trailer, which can also feature expansive entertaining areas, multiple bathrooms and an array of other luxe amenities.

Price-wise, SpaceCraft's semi platforms cost $8,000 to $9,000 (£6.3k-£7k) per linear foot. This 57-foot trailer costs around $500,000 (£394k) but they can easily go beyond a million dollars given the almost limitless customisation choices.

Italy's CMC Caravan rules the roost when it comes to totally custom motorhomes. The manufacturer's largest bespoke creations extend to a jaw-dropping maximum of 61 feet in length and resemble hip boutique hotel rooms. 

The company is a pioneer of slideouts – CMC was the first firm to create a trailer equipped with five – and its RVs each feature several, which provide swathes of additional floor space when you park your motorhome up. 

The company's Elyse design is said to cost around $1.5 million (£1.2m), which gives you a general idea of the price points for the custom designs. CMC Caravan's models are available across the world, but the company's clientele is mostly from the US.

Built to last, the one- and two-storey vehicles are strengthened by the use of stainless steel, which makes them exceedingly hard-wearing and durable.

With around 1,180 square feet to play with depending on the spec, the spaciousness of the units is astounding. Each model can fit a substantial sofa and a dining table and chairs, plus a kitchen island and more.

The kitchens are virtually full-sized, with sprawling marble countertops, stunning cabinetry and state-of-the-art lighting, as well as top-end appliances and gadgets.

The finish throughout their projects is exquisite, and the company is especially discerning about the materials they use.

Across the various configurations of their custom models, the sprawling motorhome can include two ample bedrooms that look to be the biggest in any RV we've seen.

With each room large enough to accommodate a king-sized bed, side tables, cabinets and a wardrobe, these motorhomes feel like opulent houses, rather than souped-up trailers! 

As is the case with only a select few extra-large motorhomes, CMC Caravan has two regular-sized bathrooms, including one spa-like haven that houses a bathtub, which is an incredibly rare sight in an RV.

While CMC Caravan's 61-foot models may seem gargantuan, the biggest RV in history measured an even bigger 65 feet. Built in the 1950s by the Mid-States Corporation, the articulated Executive Flagship mega-cruiser rocked a sun deck, storage for an inflatable swimming pool and other extraordinary amenities.

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