they make one that mounts across the back, under the bumper. also, one that mounts across the front, above the bumper. or you can get a bumper with a tow receiver in it already
No I've gotta 89 jeep. When I need to tow it I bought a tow bar that hooks to the front under the bumper. It's called flat towing. Got mine from Cabelas. They also sell them atmost jeep stores.
I made one for my 88 YJ that looks almost identical to the picture Superj posted. Got a receiver for 15 bucks at Harbor freight and flat bar and tube stock from a local trailer builder. Total cost was about 30 bucks.