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Is the 5000lb towing capacity refer to the rear hitch and frame being able to withstand 5000lbs, or is it the tug/pull capacity from a static start or up a hill at 30% grade, or what?
It seems like the thing to know is what the vehicle can handle up a grade and what the car's brakes can reasonably stop. The force on the hitch or the engine during flat-road, static speeds will be a fraction of the trailer's weight and the engine's abilities; it takes very little energy to keep a vehicle at 55mph, and a person balancing the trailer perfectly on the wheel could (in theory) use a single digit to steady the trailer, so forces on the hitch in static situations may not be much.
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