Best Overall: Master Lock Universal Size Trailer Locks. Best Value: Cocoweb Chrome C-Lock Heavy Duty Locking Hitch Pin. Best Heavy Duty: Reese Towpower Universal Coupler Lock. Best Universal Fit. Step 8: Fully tighten the bolts. When all of the trailer hitch bolts are in place, torque them to the values specified in the installation instruction. The amount of torque required various by the size of bolts. Some hitches only require around 100 foot-pounds of torque, while others require 150 foot-pounds or more.