I can not give correct information on the rear as I replaced the rear, the drive shaft, the tranny and the motor. I also put disc brake all the way around. As far as stopping using trailer brakes, if they are in good condition they will stop the trailer and the truck. Excessive braking will surly heat them up but if your only going several miles you should not have a problem.
I am certain someone here will help you with you questions on the rear.
