Swing Keel or Fixed
You can pull as much weight as your Jeep will untrack. The main problem with that is tongue weight. All new double axle trailers today have breaks. You would first need overload springs to level out the Jeep. Second a strong receiver hitch.
I pull a gooseneck 2 horse inline weight 2300 lbs, 1000 lbs of tack, feed, etc.. 2 horse average weight 1200 lbs add another 500 lbs for tool box tools extra spare tires etc.. Total about 3 tons. I would not think you Jeep would weight much less than my 67 chev 1/2 ton pickup Pulled from Texas to Montana more than once. Maybe you could find a cheap good older pickup and use it. Aint got to be new to go have fun with.