Quote:
Originally Posted by djbonsu
Im no expert but considering an X7 with no hitch would have the smaller OE non-msport rotors (all calipers are the same size whether mpsort or not) from the factory that is my guess on why the rating drops so much when adding an aftermarket hitch. If you have the m50i msport brakes (bigger rotors) then you technically may have the same tow rating? Aside from the trailer coding and the SAME hitch mounting points, i dont see what else could be the limiting factor(s) My $.02
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If you get the factory tow hitch you get an extra radiator. It's either used as a oil cooler or transmission fluid cooler. That extra cooler could mean the difference of the engine/transmission over heating with the higher weight or not.