Problem is that you really can't fit too much larger than 32" in the factory spare tire location if you're keeping the factory tow hitch assembly; after that it barely fits deflated and it rubs against the panhard under compression.
I would like a full-sized spare (I'm running 33's on my 4Runner and a factory full-sized 31" spare tire), but I just can't fit it under the truck unless it's underinflated; in which case it's useless to me since I don't have onboard air at the moment.