Its getting pulled by a class a 80s Rockwood rv that didn't come with a reciever end so my dad welded one to the frame. I don't know where all the weight is coming from (we have a 30gal gas tank, a set of sand tires for the sandrail, a generator, and a bunch of tools). It only became sketchy when we also hade the gokart which was a 1000 pounds plus a 200 pounds frame to make it fit and an atv with the sandrail. It didn't stop very well, espescially going down Cajon Pass. Conservatively, all the stuff weighs 5000 pounds. I'm guessing its what rooster and elk said because a lot of weight was in the rear end. We are already using stablizing bars, which help a lot. I guess I'll just try and move weight to the front and get rid of junk.