Tbird, what is your cab to axle dimension, or what WILL it be when the cab is mounted? You are sort of making one truck out of two I have and both of mine have a cab to axle dim of 60". Dont see how a pickup box will work unless you find a 9' box or a later box from the f350 pickups in the 70s that had the wheel wells set way back. I've never seen a 9' style side, but I'm pretty sure they made them.'That would be way cool.