Be warned... once you get one, you will want another, and another, and then they will be filled with tons of crap you should have thrown away... They do work good though, pops has 2 and 2 boxes off of a box truck, neighbor has 4 scattered and filled with tons of crap. Boxes off of trucks work well too, especially if you just want the truck frame and not the box. Did a dump conversion to the box truck and it worked out good.....
Definitely want it raised off of the ground.... not sure if blocks would work. We dug a big hole and filled it with gravel for a pad (was rich black dirt and it would just sink, then used some large beams to get it up. Old man ran electric to it for lights, and put a left over / junk / salvage little door on the other end. Looks pretty good. Those things are bad for treasure / garbage collectors. Obviously depends on whose stuff it is though! ha ha
misc rant jibberish