Mammoth Overland hardshell SKL is a rugged rooftop camper with its own power station

U.S.-based Mammoth Overland has a very uncanny manner of naming its high-end off-road camper trailers. WLY, ELE, and now SKL! The contracted names may seem silly, but the potential of these trailers is second to none in the industry. Having built trailers that are compact and off-road capable, the company (through consumer feedback and sales) has realized the drawback of these mobile camping solutions: After use, they require storage space in the garage. Not everyone has the room for storage at home, which is one of the deterrents for people to embrace the lifestyle.

On showcase at the 2025 Overland Expo West, the concept of rooftop camper SKL (Skull) is potentially what Mammoth Overland is realizing as an answer to the problem of storage it confronts. Built entirely from aluminum, without any soft, canvas parts, this rooftop shelter is specially designed for people who lack the ample storage space for a trailer, but want to rejoice the benefits nonetheless.

Designer: Mammoth Overland

Constructed to replicate the convenience and comfort of a trailer in a confined living solution on the rooftop, the SKL has solid walls that fold out and back in origami style. It’s entirely different from the traditional rooftop tents made from soft materials or a combination of hard and soft material. Owing to its solid, aluminum construction, the Mammoth Overland SKL has an insulated shell (it has an R5 insulation rating) and a complete onboard power system for all-season camping.

The conviction with which the SKL is conceptualized, you may be forgiven for not knowing that this is perhaps only the rooftop campers from the company. It offers the compactness and convenience of a rooftop tent, while its ideology is borrowed from the rugged trailers the American manufacturer has been perfecting for years. It gathers what the Mammoth Overland customers love the most about their trailers and moves it up to the top of the roof, making the 89 inches long, 59 inches wide, and 18 inches tall SKL a livable portable power station.

The sizable space on the inside of the rooftop camper can accommodate a full-size bed to sleep two adults comfortably. It has LED lights inside, a roof-mounted electric fan above the bed, and auxiliary flood lights on the outside to light up the campsite or the tailgate party. All of these are powered by the onboard battery pack, which is supplied its juice by the solar panels on the rooftop. The space within the SKL is naturally well lit and airy, thanks to the porthole windows and side panels which hinge outwards to allow in air on a hot afternoon. With a payload capacity of 500 pounds, the SKL can let you carry your bikes and kayaks along, if you may. Mammoth Overland is targeting to release the production model of the SKL later this year, some changes to the final version are likely from the concept displayed at the Overland Expo West.