Use it Up, Wear it Out, Make a New One

I have seen this truck several times over the years.  What I learned just recently is this is the third incarnation of his home made camper.  When they wear out (falls apart?) he just builds a new one with maybe a few slight modifications but basically they have all looked the same.  Nothing is built up inside.  It is just a bare bones truck bed with his bed, cook stove and gear.