Who has used a regular compressor cooling fridge in their pup? I want to remove the current 3 way and put a porti potti in its place and buy a small, 1.7 cu from walmart, to replace the 3 way. I'm concerned with it riding in the pup, i.e. bouncing,jarring etc. because the only place I could carry it is on the floor. Anyone have any experience with these fridges?