You can get a rear class III hitch from mopar, uhaul, reese, etc. They share the same 6 bolts on the uniframe as the gas tank skid and probably any aftermarket rear bumper AND the rear towhook.
I should have a relatively freshly painted, probably never used rear towhook available in a month or two when I get my rear bumper done. If you're interested just drop me a PM. I'd sell it for half of whatever a new one goes for plus actual shipping.
Definitely get all of the skids. You can probably get all four for under $300 if you want to go the basic mopar route.
If you want beefier skids, take a look at my gas tank skid I build in the vendors section. It is a really light and beefy gas tank skid. It's made from 1/4" aluminum 6061-t6 plate. It is CNC cut, formed, and fully welded. It is about twice as thick as the mopar and will deliver a magnatude more strength if required. There is a link in my signature.
Personally I like the lightweight materials for fabrications. I think it adds up and lighter weight pays for itself in better fuel economy, more usable power, less wear & deflection on your suspension, less wear on your brakes, better stopping response, etc etc. One skid might not be worth it by itself, but if you end up saving 50% weight on full armor, bumpers, interior and exterior storage, etc, you could save yourself several hundered pounds. I know when I have four people in it performance drops, and additions like armor should be no different. Just my humble opinion though.

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2005 KJ Renegade
Fabrications for sale:
Aluminum Roof Rack (See Page 9)Aluminum Gas Tank Skid --
Radiator Skid --
Front Strut ShimsComing Soon: Rear Bumpers with lots of options