I've removed the bed from my truck. There are two electrical modules mounted above and to each side of the plate that the spare tire used to hang from. I think one is fuel pump related, and I'm fairly certain the other is the trailer brake controller. Both are mounted horizontally, pushed up tight to the bottom of the bed. The question is, if I had to, is there any reason why I can't re-mount both of them vertically? I'm trying to package some equipment in that space, and it's looking like I won't have enough room to leave them oriented the way they are.