Guys the issues with our braking system is the auto adjusters in back really don't work. So we end up braking with most of the stopping force on the front rotors. Hauling a load will heat up the rotors and crack or warp them. I cracked 2 front rotors till a Midas brake guy showed me what was wrong. changing the hydroboost brake system helps with the rears being out of adjustment but wont fix the poor design either. We need to get under there and adjust the rear brakes manually when the parking brake peddle sets more than 1/2 way to the floor. Increasing the wheel cylinder size is a great idea too. Sure we have discussed that here before but don't recall the part numbers. I think the cylinders are the dually size but they fit the single rear wheel size fine. Its that or it was a different make truck wheel cylinder... CRS...