You can loook under there and see if you have coil springs in the back. I would go with some OME or Bilstein shocks like Spike said and put some airbags in the springs. Another guy on this forum did that to his Disco II for hauling his street motorcycleon a motorcycle carrier that plugs into the hitch. It leveled it good with over 400 lbs. on the back. You will alway need to have at least 5Lbs. air pressure in the bags when there is no load.

Willie