For me, the answer to that question is in a Baja Coyote race rack from Raptor Addict.
But if I'm not mistaken, G (username E63) shows in his build-up thread how he modified the stock spare location to retain his tow package and fit a 37 down there
Yep, that's exactly what I was getting at. 37s are one of those mods that there is more to than meets the eye. I just wanted to point out that finding a place for the spare, be it on a rack or modifying the under-bed storage to fit one is definitely an added expense that some people don't think about.
I mean there's also the option of just strapping it down in the bed, which was pretty much my plan, lol.