http://www.thorforums.com/forums/f8/...tire-5819.html
I carried a spare in the back compartment (just the tire - no rim) on my trip to Alaska but it takes up a lot of room. One does fit quite nicely in my Axis underneath, behind the rear wheels (see above). Since you will have roadside assistance help you anyway, they could easily get it out, if you could have someone help you get it in there. Then you would never have to worry about it and it would not fill the limited space you have in that rear compartment.