I've got the rotted decking ripped off of my flatbed, getting ready to go pick up new treated 2x stock 16' long. The original deck was 2x8x16's with one cut down to fit, and they used counter sunk torx head 1/4x20 bolts threaded into the crossmembers for retainers. I was originally going to simply replace with like size, replacing the threaded fasteners with 1/4x20 carriage bolts but the price of 2x8's, 2x10's or 2x12's is within $5 of each other. Is there any advantage to using wider planks, other than fewer bolts? I'm thinking it really does not matter much, but this is my first trailer deck job