big diffrence is that the rails are painted to match the truck and the inside is all chromed out and such. just because its a show truck dont mean it dont go OTR. a friend (at work, not really a friend) bought one 215G's he got it 35g's off cuz the messed up the paint on the rails and the interior was the wrong leather. they offered it to him insted of him buying a diffrent brand. there was a few other things that he ordered that they screwed up.
still....its an amazing thing. you should see some of the OTR guys rides, i love seeing guys with like 50 lights in the rear of there truck...(you know whos geting DOT'ed)

(ps.s i was just saying he deserves a great truck, just for having that!)