regarding the rear wiper, there are many threads and solutions offered, but the real problem with the rear wiper (once the motor is working properly) is the motor mounting method and that the sheet metal of the lift-gate is too flimsy. the combination of the weak sheet metal, the rubber bushing mounting method and the pressure exerted by the wiper arm spring, cause the motor to be pushed to the left. if you stand behind your truck and look down at where the shaft protrudes from lift-gate, you'll notice that it pushed to the left of center. this left-shift causes the wiper arm to not contact the window in the middle of its sweep. grinding down the stops on the wiper arm helps, but the real solution would be to somehow brace the motor so it doesn't get pushed to the left. i've had some success by putting a spacer under the right-most motor mounting bolt, but at best i'd call it a 85% solution. i've also tried grinding down the wiper arm stops with about the same success. it's just a bad design. after playing with it on 4 different vehicles, i've decided to ignore it. if you come up with a better fix, please let us know.