I have the Rock Hard 4x4 rear tire carrier bumper on my TJ and highly recommend it.
It is very heavy duty, and doesn't rattle or sway. It has recovery points, tow-rated receiver hitch, carries a 38 inch spare tire, and comes with mounts for a hi-lift jack and CB accessories. I frequently use the optional cargo rack and gas can holders.
They are made in Nebraska.
The system is designed to be very adjustable. The tire carrier is both height and depth adjustable by a significant margin, so you can have your tire as high or low and as far in or out as you want. The bumper itself can be mounted an inch higher than factory to hide a body lift or fir extra clearance. Even the cargo rack and can mounts are height adjustable to a degree, and the cargo rack is depth adjustable to a degree.
The biggest downside to it is that it is quite heavy. If you're highly weight conscious, a body mounted tire carrier will save weight versus a spare tire bumper.
For the most part, YJ and TJ bumpers are often interchangeable. So if you find a good bumper for sale for the TJ, it may also fit the YJ.
No matter what bumper or carrier you get, you must get and use frame brace brackets, which are offered by just about every bumper manufacturer. On the YJ (and TJ), the rear crossmember is prone to bending and even tearing off the frame rails. The braces take the load off the crossmembers and put it straight to the 1/8" thick frame rails. The last thing you need is to have a bumper fall off while bouncing around or get ripped off the frame while being winched out.
