My rig has the shelf and mount for a spare in the last basement compartment on the passenger's side. Mine didn't come with a spare either, but I am considering buying one just for the insurance - even if I don't change it myself at least I know I will have a working spare when the roadside assistance folks show up.
Bubba & Chiquita + Two Vizslas (Barley and Sophie)
2008 Georgetown 315DS SE LTD
2011 Jeep Wrangler Unlimited Rubicon
Sterling All-Terrain Tow Bar - SMI Stay-In-Play Duo
Do What You Like - Like What You Do!