Re: Full Size Spare on "Compact" Wheel?
The full size spare is full size in diameter, but is a narrower tire as MDB mentions. That lets the cargo area lid close and the load rating is the same. (which is why it's required/included for/with the factory tow option) You may be able to mount the OEM spare rubber on your wheel...check the specs of the actual tire to see what the wheel width range is for it. If your wheel is wider than the allowable spec, don't do it.
2012 GC Overland Summit - Winter Chill with New Saddle interior. 5.7L HEMI V8 - Pirelli Scorpion Verde Plus "shoes" - LED fogs and DRLs
Day-job...Telecom Technical Sales
Avocations...Woodworking, Equestrian, Food, Photography