I have an old 5x8 rental trailer that I made into a camping trailer. Some friends christened it the Mobile Man Cave. I built a box along one wall that holds sleeping bags, mattresses, cooking gear, lanterns, etc. and is the same width as a military style camp cot so those mattresses fit. On the other wall there's a folding table, and a big water tank I made out of an old Navy powder canister and an RV hand pump, it holds about 30 gal. I also put a loft in the front to hold misc. gear. I got a metal box on the tongue for shovel, axe, saw, other tools and hardware. It's not much to look at, but it's comfy. Plenty of room for me, and to haul our larger tents and etc. when the whole family goes camping.