I really don't think it's a weight issue, I've got plenty already on board and still have lack of rear flex. Here's a pic with the front end doing all the work and the rear doing jack squat. The left rear wheel should be fully stuffed.
Umm, I could be wrong here, but what exactly is supposed to compress the left rear? I'm not putting down the lift, I had one that acted similar, but in reality the lift is so tall that physics is taking over. Gravity is pulling the body that way, so unless something is going to level the body, i.e. anti sway bars in the fron, then that's the way it's going to act.
Bart (been wrong before and it could happen again)