When I haul locally I will just throw two chains w/ binders on, one front and one back. If I'm hauling a distance or cross state lines then four chains w/ binders go on, one for each corner. Rules vary between states. I live in South Dakota. Hauled through MN, WI, ND, IA, NE and IL. I've been through checks in all of those states and have never been bothered. 99% of the time it's my own stuff I'm hauling and the 1% when it's not mine it is while it's on my trailer 8)
Not saying I'm right, just saying what has worked for me and I don't plan to change it until I'm told otherwise.
Casey in SD