Some years ago I researched WD hitches for boat trailers, there are basically 3 issues: 1) it puts extra stress on the tongue which is already one of the more stressed structural members of the trailer frame 2) you'd need a special adapter to hook up the torsion bars, and need room on the tongue to bolt that on 3) if the WD hitch has chains for the torsion bars, it will interfere with the operation of surge brakes, you really have to use The Equalizer, which is made to work with surge brakes, it does not use chains.
Having said that, I have used Air Lift air bags in the rear coils, these do not re-distribute weight but the do greatly improve towing performance in terms of ride and control. They are cheap and pretty easy to install on most vehicles.
About towing near the limit, well until I actually weighed my '88 H-200 on the trailer, I didn't really understand why our old '98 ZJ 4.0 struggled with it. After all, FW said it was supposed to weigh about 3,000 lbs. The Jeep was rated to tow 5,000 lbs. Well. I weighed it and the boat + trailer came in at 5050 lbs. When I put the boat in the water I weighed the trailer and it came in at 850 lbs. That makes the boat about 4200 lbs. For the same reason, it explains why our '07 Grand Cherokee 5.7 tows it so easily. It is rated at 7200 lbs. So the boat & trailer weight is about 70% of the Jeep's tow capacity. Moral of the story is, if you tow short distances, at low speeds, you can do what you are proposing if you are careful. However, any high speed towing, highways, hills, I would not do it. The tow vehicle will really suffer. Last thing, make sure your trailer brakes work. One of things I did was replace the 3500 lb axle with a 6000 lb axle, that allowed me to use 12" brakes, which stop much better than 10" brakes. That, and 225/75-15 tires, preferably Load Range E.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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