Escaping the grid shouldn’t be restricted to the balmy days of summer. When the mercury plummets and the snow begins to fall, most teardrop trailers are forced into a depressing winter hibernation.
The brilliant minds at Mammoth Overland have completely rejected that notion, taking their already legendary HV base and winterizing it to the absolute extreme.
Meet the Mammoth Overland WLY Trailer (pronounced “Wooly”), a true four-season off-road sanctuary. Priced from $59,500, this mobile fortress is engineered to shrug off sub-zero temperatures and unforgiving environments, ensuring your overland adventures never have to pause for the spring thaw.
Arctic-Grade Insulation and Heating
The defining characteristic of the WLY Trailer is its uncompromising defense against the biting cold. Unlike standard aluminum cabins that act like a refrigerator at night, this rig is meticulously lined with premium wool insulation, achieving a highly impressive R12 insulation value.
This tactile upgrade completely eliminates the shock of brushing against cold metal walls while you rest on the luxurious, cabin-filling king-size mattress. Taking the warmth a step further, the floor boasts a massive R25 insulation rating.
To actively combat the freeze, Mammoth swapped out their traditional marine heater for a heavy-duty Truma VarioHeat system. Delivering an astonishing 11,500 BTUs of propane-powered forced air—which is technically enough power to heat a 600-square-foot house—it regulates the micro-cabin’s temperature rapidly and silently.
Coupled with winterproofed, heated lines for the on-demand hot water outdoor shower, you have a certified Arctic basecamp.
Unrivalled Off-Grid Power Ecosystem
Surviving the harshest elements requires a serious electrical foundation, and the WLY overdelivers. The beating heart of this off-grid ecosystem is a colossal 800aH Lithium battery bank equipped with state-of-the-art self-heating technology, guaranteeing your power won’t plummet when the frost sets in.
However, this trailer isn’t solely reserved for snowy peaks; it is equally prepared for scorching desert surf trips. The cabin is equipped with a high-performance Dometic RTX 2000 air conditioning unit.
Incredibly efficient, it provides up to 12 hours of run time on Eco mode by sipping a mere 19 amps. To keep this massive battery bank constantly topped up miles from civilization, the trailer is fully loaded with dual 100W portable solar panels and an included backup generator.
A Formidable, Trail-Ready Foundation
Beneath the cozy, climate-controlled interior lies a genuinely formidable off-road chassis ready for the worst trails imaginable. The WLY rides on a heavy-duty Timbren 3500HD independent suspension system, rolling aggressively on 33-inch TOYO Open Country AT3 tires wrapped around striking 17-inch bronze torque wheels.
To cut through the darkest winter storms, it utilizes a suite of LED amber roof rack lights and yellow floodlights.
The exterior is an absolute masterclass in rugged, modular utility. It boasts an extra-large observation platform on the roof, four exterior MOLLE panels for custom gear mounting, dual Rotopax, integrated traction boards, and even a mounted Krazy Beaver shovel.
Around the camp, it provides all the necessary creature comforts, including a slide-out kitchen equipped with a two-burner stove, a sink, an electric fridge, and a sprawling 90-degree awning to shield you from the elements.
If you are hunting for an unapologetic, all-weather adventure rig, the $59,500+ Mammoth Overland WLY Trailer is a spectacular ticket to year-round exploration.
