Since we're talking hypothetical there are three basic considerations: drawbar pull: consider vehicle weight, gearing, torque, and horsepower.
amount of towed weight supported by tow vehicle: consider springs, tires, and frame strength.
stopping ability: consider CGVW, tow vehicle weight, brakes, speed from which stopping is needed, and frequency of stop required.

FWIW: The owners' manual recommended a CGVW not to exceed 3500 lbs for a 73 Dart.

The old axiom, "Power without control is nothing." is true. Once towed a G-III (38,000 # empty) with a 12 hp Kubota tractor. It was a lot easier to get going than to stop. It is a helpless feeling to have the brakes matted and be pushed along by a $2.2M aircraft. Thankfully, I was taking it OUT of the hanger.

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You can't fix stupid. - Ron White