I built the camper displayed with the following features. (I guess you wouldn't call this an Expedition Camper but if it were on a 4WD PU it might be. I am into rock climbing and I do need to go, and often do, into areas where some of the rigs shown on this website would be nice but 99% of my travel is on high speed pavement so am happy with the 2WD and a winch, which has come in handy more than once) I wanted a dual purpose vehicle. So I built an aluminum flatbed for my truck. I made the flatbed sit at the same elevation as the original PU bed because I didn't want to lose the height required of a standard flatbed by sitting above the rear wheels so I made wheel wells that extend up into the flat bed so technically it isn't totally flat but works well. I made corresponding clearance areas in the camper to accommodate the wheel wells. When I put the camper on the truck, I have to not only slide it in but I also need to lift the camper about 5" to get it over the wheel wells. When I have the camper off I have stake sides which go on the flat bed. I can convert the truck from a flatbed pickup to a camper in less than 30 minutes. I have a cable hoist system I designed for my garage that lifts the camper off and on. I wanted solid sides not fabric and easily openable glass windows so designed the folding panels you can see in the erected position in the pictures. I also wanted a larger dinette so designed the slideout you can see in the pics. The slideout and the top all go up with electro/mechanical actuators. The unit is fully self contained with toilet (self contained), shower (The toilet and shower are in a 32" X 32" room and the toilet slides into the wall to make the shower very roomy) I have a stove and 3 way frig. I have one fresh water tank installed in the RV and another fresh water tank and a grey water tank installed under the flatbed. Total fresh water capacity is 60 gal and grey water is 15 gal. I have a solar panel on the top also. By building a camper that fits on a flatbed there is much more room for placing all the interior components. I completed the camper a few months ago and it has been operating nicely.