Introduction
The Rossmonster Baja Trail LX is a four-season adventure truck built on a Ford F-350 chassis with a fully retractable powered roof, a wet bath, hydronic heat, and 1,000 amp hours of lithium storage. IWS, a Super C RV dealer out of Mountain Home, Idaho, is now selling these and walked through a fully specced LX unit during a winter trip to Featherville, Idaho, with overnight temps dropping to 15 degrees.
The Builder
Rossmonster has been building adventure vans for over ten years and has been developing the Baja series specifically for around three to four years. The first Baja prototype and the current production unit are described as night and day different, and the development philosophy was straightforward: build it, then try to break it. The camper shell has intentional flex built in so it can breathe on trail and over rough terrain without the fiberglass cracking. Rossmonster backs the whole thing with a three-year, 36,000-mile warranty, which is not standard in the RV industry. Most manufacturers offer one year.
Production is ramping up in a new facility. This isn’t a one-off custom build. Floor plans and options are set, ordering is straightforward, and lead time is running around three to four months.
Vehicle Platform and Base Specs
The chassis is a Ford F-350 Lariat Ultimate with the 6.7 Power Stroke diesel making 475 horsepower and 1,050 foot-pounds of torque through a 10-speed automatic. That’s the full factory power rating, not the derated version that shows up in a lot of RV applications where the same engine gets knocked down to around 330 horsepower. Towing capacity is 10,000 pounds. The IWS unit towed a snowmobile trailer up to Featherville without issue.
Suspension is a Carli pintop system with King shocks tuned specifically for the F-350 and the Rossmonster camper load. Tires are BFG KO2s in 37 inches on Method wheels.
The front bumper is a Bodyguard unit with a Warn 12,000-pound winch and synthetic rope integrated into it. There’s a mix of Rigid and Baja Designs lighting across the front and rear. Importantly, the bumper integrates with Ford’s collision mitigation systems, so adaptive cruise, lane departure, and forward collision warning all stay functional.
The Shell and Roof System
The camper shell is fiberglass over aluminum crossmembers, fully insulated and fully sealed. At full height it sits around 12 feet tall on the exterior. Lowered, it drops to just under 10 feet. That 14-inch difference matters both on-road, where a lower center of gravity and reduced wind resistance improve fuel economy and handling, and off-road, where clearing trees and managing off-camber situations gets easier with less height up top. The roof raises and lowers with a single button.
Interior height with the top up is 6 feet 6 inches. With the top down it’s about 5 feet 3 inches, so you’re ducking but it’s still usable.
The camper is fully removable from the truck bed. If the chassis gets swapped out or the cab needs service, the Rossmonster shell comes off cleanly.
Exterior Accessories
The passenger side has a Fiamma awning with manual legs, dual-pane 360-degree windows, an LED porch light, MaxTrax MK2 recovery boards, and an integrated fold-out table with an exterior outlet. That outlet is sized for small appliances.
The driver side has the diesel and DEF fill points, a 30-amp locking shore power plug, an exterior shower, a purge point, and the fresh water fill. Fresh water capacity is 40 gallons with an 11-gallon gray tank.
The rear is built around a Molle grid panel that accepts standard Molle-compatible mounts. This particular unit is specced with a ski box tall enough for full-length skis, a full-size matching spare in 37 inches, and a mini storage box. There’s also an option to carry a Ford factory-size spare underneath. The rear bumper is a Rossmonster steel unit with Pathfinder LED lights switchable from the upfitter switches. A bulletproof hitch receiver handles the 10,000-pound towing, and an ARB onboard air compressor is built into the bumper area for trail tire inflation.
Entry and Doors
There are five doors total on the Baja Trail. The main entry is a split design: the lower half opens independently when the roof is in the lowered position, so getting in and out during travel doesn’t require raising the top. With the roof up and camped, both halves open for a full-size doorway with a screen option. Entry also gets an electric keypad, an integrated door handle with a magnetic hold-open, and an AMP Research step that tucks away. The chassis also has powered running boards.
Interior and Kitchen
The LX floor plan is specced here with white oak cabinetry, brown leather upholstery, and white Corian-style countertops. A topographical map design runs along the backsplash on both sides of the kitchen area.
The kitchen has a two-burner induction cooktop and a 12-volt refrigerator. On the opposite side, a large sink sits under a countertop insert that lifts out when the sink is in use and drops back in to cover it. The faucet folds flat. There’s a silverware drawer, a microwave, and outlets integrated at several points along the cabinetry, including a 110-volt outlet under the sink area. Storage runs throughout the upper cabinets on both sides.
The cabinetry is built with a lap-banding process using a machine brought in from Austria. The result is a sealed wood panel that’s significantly lighter than standard cabinet construction and resistant to water intrusion, which matters on a truck platform where weight is always a consideration.
The convertible dinette uses a lagoon-style adjustable table and seats at least four people comfortably. It converts to a sleeping area as well.
Sleeping
The LX sleeps four. Two people in the dinette conversion below and two in the over-cab bunk. The bunk has a true queen-size mattress, adjustable reading lights, dimmable LED overhead lighting, windows at the foot end that tip open for ventilation, storage cubbies, USB chargers, and a USB plus 110-volt outlet. The ladder to the bunk is angled rather than straight vertical, which makes getting up there considerably easier.
The bunk has a skylight with a day shade, blackout option, and built-in lights. It opens fully, so you can stand up through the roof from the bunk or access the roof for service without carrying a separate ladder.
Bathroom
The wet bath is the defining feature of the LX floor plan. It’s a full shower stall with a wand, hot and cold water, and a floor grate useful for drying boots. Tall enough for someone at 6 feet without issue. This unit is specced with a Laveo dry flush toilet, though Rossmonster also offers a true composting toilet and a Thetford cassette toilet as options. The dry flush toilet is removable from the shower stall, which opens up the space when it’s not needed.
There’s also a fold-up countertop adjacent to the bath area that latches down flat when not in use.
Windows and Ventilation
The dual-pane 360-degree windows run the perimeter of the camper with day shades and full blackout shades on each. All windows tip open. There’s a MaxAir roof vent above the main living area as well. The window emphasis was intentional in the interior design, keeping the space feeling open even when fully buttoned up in cold weather.
Climate Systems
Heat comes from an Aqua-Hot 150 hydronic system running a diesel burner off the truck’s 50-gallon fuel tank, or from shore power when plugged in. That one system handles heated floors, the furnace, and hot water. The water tank is mounted above floor level so the plumbing stays functional in hard freezes. Between the insulation, the floor heat, and the diesel burner, the unit was holding comfortable interior temperatures through 15-degree overnight lows in Featherville.
Cooling is handled by a Nomadic X2 12-volt air conditioner that runs directly off the batteries without needing the inverter in the loop. The truck’s cab AC is separate and also available.
Electrical System
The battery bank is 1,000 amp hours of lithium iron phosphate. A 3,000-watt Victron inverter handles the AC loads, and 600 watts of solar panels sit on the flat roof. A flat truck roof fits more panel area than a curved van roof, and 600 watts on a 1,000 amp-hour bank with a diesel heating system means running the batteries down takes real effort. After 60 days of use including a full winter weekend with the heat running continuously, the batteries haven’t been killed yet.
A second alternator is installed on the truck and wired solely to the house battery bank, so driving charges the system independently of the solar.
System management runs through a Firefly touchscreen panel that handles battery monitoring, fresh and gray tank levels, lighting control, water pump, and mobile diagnostics with app connectivity. The Aqua-Hot has its own touchscreen controller. Victron battery management software is also accessible from the same cabinet.
On the Road
At a driving height of 9 feet 11 inches with the roof lowered, the center of gravity feels low enough that it doesn’t drive noticeably taller than a stock F-350. The Lariat Ultimate package means heated and cooled seats, heated steering wheel, Bang and Olson audio, heads-up display, wireless CarPlay, split-screen navigation and audio, and Sirius XM. Ford’s 360-degree camera system and bird’s-eye view remain fully functional with all the Rossmonster components in place. Rossmonster added a Wolfbox digital rearview screen with recording capability and an adjustable camera showing a live view out the back, independent of the navigation and audio displays.
The F-350 chassis means service anywhere there’s a Ford dealer, no special bay required, no commercial rating needed, standard low-sulfur diesel. Parts are available at any auto parts store. A gas engine option is available on order, and a Ram chassis can also be specified.
Final Thoughts
Starting MSRP is around $370,000. For that, you get a truck that’s daily drivable, HOA-friendly in a residential driveway, capable of towing a trailer, and genuinely comfortable in four-season conditions. It’s a narrow category but there’s not much else built quite like it at this scale on a half-ton-adjacent platform.