What I have tried in a limited extent is to take a hard wood 2x4 and with a forstner bit drill in straight half way and then turn sideways towards the center of the board. Need to come out of the 2x4 with the bit into another piece of wood. Using 1/4 inch chain and chain binder make the chain tight. If you just wrap straps it won't keep the center of the pile down very much in my estimation. You need 2 such 2x4 with 2 holes each (spaced the size of the stack of planks or boards) one length of chain with no hooks on at least 1 end and one chain binder spaced apart. It sure does keep the pile together for moving. Only really keeps the boards flat not from getting a crown.