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Dont know the size of either of mine. But make sure it has trailer brakes if your towing a car and that they work and work well alot of the electric brakes will break a wire off at the drum and sometimes the wire is too short to just re solder. So you have to tear into her a bit. Easy to test and would not buy one with out testing them. Just turn the percentage of braking up on the controller and lightly push the brakes and it should engage them without the trucks brakes doing much if any work and let them stop you. Could also serge them at a low speed. But brakes and them working proper is key otherwise your going to just keep warping and burning up your trucks brakes.