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Thanks for the tips, I recently borrowed a 4600# trailer for a long road trip.
I did not have the bars for the WD set up on the way out (thought it was light enough and didn’t need). I could not believe what a difference it made in the way home, but still had squat in the rear. I was thinking a heavier loaded toy hauler would be over doing it, maybe Deaver HD +3s are in my future as well.
As others have mentioned you will need a WD hitch to be within spec for sure...assuming you are at max. Personally I tow an overland camper...Patriot X3 if your interested...it's rated at 3500 max so I'm at about 350-525lbs tongue weight using the 10-15% rule. I do carry recovery gear and some extras in the bed so sag was a concern. I called Deaver to get their advice and wound up with a custom set of springs. They built a set using the stock Raptor springs as a base then added two leafs. The cost wound up being cheaper than the +3 pack which they specifically said was not recommended for towing. The +3 pack is a progressive spring whereas the stock spring and the custom one they built for me is a 2 stage. I also added the RPG stage 2 bump stop kit. When all said and done when I drop the trailer at base camp I can still Raptor around while having improved towing capability. Best of both worlds...at least for me. In your situation you are towing a much larger load so not sure what Deaver would suggest but I'd call them if I were you and describe your use case and see what they say.