Did I miss it, or has no one offered a suggestion of carrying the spare on the roof? If you don't have rails up there already, hit up the junkyard, or Craigslist yourself a basket/rack for cheap and tie it down up there. If it were me I wouldn't want the hitch mount spare getting in the way of a good recovery point, or access to the cargo area for tools or recovery gear. Plus the fact that things gotta come out of the receiver a good few inches at least, and that's departure angle sacrificed.