Wheelbase probably has a lot to do with it. I would be more comfortable towing 2,000 with a Wrangler than a Patriot, despite what it says on the paper
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Wheel base of both the tow unit and the trailer.
When the length of the trailer from hitch ball to wheels is equal or a bit greater than the wheel base of the tow unit you generally are OK given everything else is looked after, sway etc.
When it is shorter like on most utility trailers, etc. you will have a twitchy, active tow going on.
If it is too long the trailer can and will start steering the tow unit from the rear. Weight dependant there, of course. Speed factors in as well.
I'd be thinking, like most things towing in NA that erring on the side of safety due to liability they keep the trailer weight down on a short wheelbase Jeep like the Wrangler because most folks don't cover all the variables, they just hook up and go.
Also with a hitch and trailer you are better off as low as you can get, most folks in a Wrangler will be towing up high and that only works in a fifth wheel type set up. As long as you don't go below the tow vehicle's theoretical centre of gravity.
A Wrangler with a fifth wheel in the bed would pull a house, I bet.
