[Mike C]

Camber is the inclination of the spindle relative to the vertical. incrasing load on the rear should INCREASE camber by tilting the spindle further backward. But the problem is weight IMO. There just isn't enough weight on the front end with that trailer. The tires are just barely contacting the road. THis is what causes head shake in a high perf motorcycle as well. Using a load leveler hitch will help transfer weight back onto the front of the vehicle. The best option for pulling a trailer of that size/weight is obviously a gooseneck trailer, but that's big bucks. Go with the distribution hitch and my guess is most of your woes will vanish.