what is the weak link that accounts for the hummers low towing capacity? Is it based on engine performance, brake size, tire ratings hitch type? What can be done to increase it's ability? I have supercharged so far (plenty of power now, and no more constant shifting going up hills) brakes will be next. I have towed aprox 6500 lbs with no problems, looking to tow aprox 8-8500 lbs
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