Back in the day when I used to wheel often and everywhere I had a extra cab npr shortie(12ft box). I really liked it I put a rv style a/c heater combo on top with a diesel generator and put a stove,fridge and microwave in the very front of the bed. I bought surplus aircraft bunks(bed that fasten to the outside wall) had 4. I put a used counter top with tools/spares on the other side. I never really had a problem with it. I sold it do to the wifes brain tumor and the ever on going doctor bills. It had over 500,000 miles when I sold it, could set the cruise at 70 and pretty much for get it. It got around 10-12 mpg loaded the whole time I had it. The only service issues was the alternator about every 60,000 or so miles it would quit charging. If I ever have the chance to do it again I will buy another. IMHO