Yeah that's how my adrian advantage box is, off the bed, on the rails. I can fit about 10-12 sheets beneath it, actually a 6x6 post fits just perfect underneath it. I had a box from Tractor Supply, it was a dual lid box and they opened like butterfly wings...I left one up and pulled into the garage...yikes....ripped off the door and bent the sucker in half. Learned my lesson!