The pop up family: Hallmark, Outfitter, Four Wheel Camper, All Terrain Camper, Palomino, Northstar, etc. They are lighter, especially if you don't overload, pop up means lower center of gravity and structure is either welded aluminum or composite. To keep down the weight, people don't opt for all the tanks (fresh water grey and black water. There is less storage however some companies offer to build on a flatbed so you have outside storage compartments.