Tom - I had it custom built after Moab.
Watching all the other bumpers at work, made many of the design decisions for it.
Like, putting the cans between the tire and the lift gate.
Also, since it fits in a hitch receiver, I can also move it another vehicle, if needed.
I found two other tire carriers on the net - they are $200 and about $400 apiece. Explorer Express also carries a rear-bumper tire carrier that bolts on. None was rated for a 33" tire. None had a place for the high-lift jack. None could carry two jerry cans.
Cost for the custom build? about $500 if I remember correctly.
As for wobble/lean, it doesn't move much. There is a expander in the receiver portion, that locks it in. The shop that built it did a really good job on it. When I was at clear creek, It didn't have the can carriers portion done. Some people who followed said it didn't really move a lot (it did move though).
When I attempted tank trap, it was on, with a full 5 gallon gas can and full 6gallon water jug on, high-lift, and 33" inch tire. Not a mark on the tire, cans, high-lift, or the rear tail gate afterwards! So I'm damn happy about that!
My only complaint? It gets expensive for any real good rear tire carriers/bumpers for explorers. I've probably spent close to $1.5k to get my bumpers right. (that's cost of bumpers, and then custom welding, and the tire/can/jack carrier).
For those interested, it was custom built by a firm here in the SFBay area called Fremont Hitch, Weld, and Muffler. They have a web page at
http://www.fhwminc.com. Note - if you want to duplicate what I have, I can take measurements and such - but they wanted the truck for a few days, so they could make sure everything fit together.