Congrats on converting to a real truck [img]images/graemlins/40BEER.gif[/img]
Truely, i think that having it on the back is a huge pain in the ass, because you probably won't be able to even open the window without swinging it out. But to each his own....
I wouldnt' bolt one to the body like teh old blazers/broncos. I would either get one that mounts to the bumper, or replace the bumper with one that has a tire carrier. I don't know what other mods you have on your truck, so this may look odd, but this is what i would reccomend.
From 4x4 Iron
you can get one like i described. Here is a pic of it on an older body style blazer.
But keep in mind that the tire carrier worked better on those because the windows rolled down into the tailgate rather than opening up, so you could still access cargo without swinging out the carrier.
Let me know if you like the idea of an aftermarket bumper with carrier, and ill post links to some others. The 4x4 iron one was just the first to come to mind, but there are many others.
Anyways, good choice in the 2 door tahoe!