Bronco tow capacity is limited right now by the ClassII hitch, that's all there is to it. The frame can handle a ClassIV hitch same as the Ranger since it's the same frame.
The Bronco is prewired with a 4/7 pin connector, I don't see any reason to be worried about more tow capacity. Aftermarket...
Mfg's like to use the SAE J2807 standard before they issue tow ratings http://www.trucktrend.com/how-to/towing/1502-sae-j2807-tow-tests-the-standard
Even if Ford does not test J2807 compliance up to the current Ranger's max tow rating, a Bronco owner can slap on the components to make it...
Aerospace 303. Rubber, vinyl, plastic, love it and soak it up. CV boots, tires, radiator hoses, door seals . . . buy a gallon and use it liberally. Trailer and boat mfg's recommend it as a fiberglass protectant if you have one of those.
Black Diamond 4-dr 2.7l would be my choice.
The 4-dr model seems OK to me. 2.7l Black Diamond is a good start. I would have to put a better tow hitch on it if Ford doesn't, but I think that is doable aftermarket.
Seems to check a lot of boxes on the SUV wishlist. Great approach/departure/breakover, great engine power, easy to put larger...
Hmm, light tow cap decreased my initial excitement. Right away I thought "Install ClassIV hitch and you have 7000lbs tow capacity!" Should be doable since it's a Ranger frame. A ClassIV hitch won't affect offroadability.
Some outfit will build a hitch that mounts where the two tow hooks...