[swamp rat]

Here's a pic of the mounting brackets i had, if you can zoom in on them you would see it's basically a U shaped channel with 2 holes drilled for the bolts that attach to the boards, then a series of holes on the backbone of the U channel to attach one support bracket to the frame, and a strap that was screwed into the cab. The bolts that slide into the boards can be made from regular bolts or carriage bolts by grinding the heads down so they will slide into the channel. You could build the brackets out of squair stock.