You know, I could not figure out why they bolted down the boards, but I was hesitant to leave them loose since they came that way. My trailer captures the back end under the edge of the checker plate dovetail, and up front there's a piece of 2" angle welded across to catch the front. I'm pretty sure I can lay a board in place and use a long pry bar to bow it up to pop into place. The originals were very tight side to side, and I'm thinking a little bit of expansion room would be better, especially since I'm putting them in place very cold. What width do you use, and how much side to side space do you leave when you cut that one board to fit?