Here's a couple for your consideration made by TireGate:

http://tiregate.com/hg_series_0.shtml

The only thing I don't like about the swing-out version (TireGate-I), is that the tire is NOT centered on the back (it's off to the left-side) but it does have the thru-put receiver hitch and lighted license plate.

The TireGate-II version (bottom of link) is very simple, stout, and centered. However; it needs to have a "pivoting" L-bracket with removable security pins, so the tire can be tilted completely downward and rest on the ground without having to remove it from the receiver hitch (so the rear cargo hatch door can be opened/closed). The TireGate-II version would also need a thru-put receiver hitch and lighted license plate to complete the unit.