Pay VERY close attention to the frame. Other than the BAL Ultraframe, there are two basic types out there. One has forged I-beams and one does not. One is significantly stronger than the other. And when it comes to the "better" one, some of them are stronger because they have re-enforcing of the frame around the spring hangers (gussets, for ex.) A weak frame can cause you all sorts of problems.
Their units won't be light exactly, but Nash and Outdoors RV make their own in-house heavy duty off-road frame. Might be interesting to go check one out to see what the frames are like. The Ultraframe is on a few ultra-lites. I think the Jayco Whitehawk does IIRC. It's a nice looking frame.
I would agree with going to a 3/4 ton.
