The Stovebolt Site Forums The Shop Area General Truck Talk how much can a 53 1/2 ton GMC tow?

IIRC, the suggested amount of weight on the hitch is 10 % of the gross weight of the trailer and load-- this should allow proper steering and stopping. It also should prevent the trailer from swaying from side to side as you travel. You might confirm this with a local U-HAUL store.
Good luck.
Glenn