They are a bit light in the rear.
-Do you have a hard top or soft top?
-Is the Jeep lifted?
-What type of shocks did you put in?
-What size tires are you running, and what pressure are you running?
Jeeps are light. Some common mistakes are running too much air in the tires (go by the door jam sticker for stock tires, NOT the tire sidewall. Ask around the forum for larger tires), and using too stiff of shocks/springs for a lift.
Air pressure is the big one. The sidewalls list the MAX load pressure, not the best operating pressure for any given vehicle. I think the sidewalls of my 35x12.50x15's say 35psi, but if i run them over 25psi they feel like wagon wheels.