TweenerLJ, that is a very nice looking LJ.
For hitch haulers, I have found the UWS aluminum model to be a very good and light choice - and it is still rated for 500lbs. Here is a link:
http://www.uwsta.com/rec_carrier.html
UWS, a maker of pick-up bed tool boxes and other items - they have the light blue marlin logo - makes a weatherproof aluminum box to fit the hitch hauler too.
A raised bar like the hitch hauler shown by TweenerLJ is great for the rear, and the tailgate issue is gone if you don't have the top or rear soft window on. Depending on what you're carrying, I have found a front bumper mounted hitch receiver to be the better place in some circumstances. My LJ has both front and rear receivers, and my coming JK will have both as well.
You won't loose sight of the front mounted hitch hauler and though it hurts approach angles it affects performance less when mounted at the same height front or back because the approach angles are better than departure angles. Most bumper mounted receivers are pretty high as well.
On the down side, there is a limit to how high you can load it for visibility but also to allow enough airflow to keep the radiator working and cooling the engine. Or if you go high, you need spacing between items to allow the air through.
JPK