carrying an unmounted spare tire

I have very low expectations for any roadside assistance. I carry an unmounted spare, so I would hope that the truck sent would have the equipment to mount the rubber to the rim. If not, I would need a tow to the nearest major town. Then I will have to sit around a few days while a new 22.5 tire is shipped. This will indeed be expensive. In short, I only anticipate roadside help to get me to a safe repair location for more help...probably at my expense. The problem with a blowout is that the damage can be much more extensive than just the tire. Wheel wells, cables, electrical, and siding can all be damaged. If it is a front tire, dropping to the pavement can damage the wheel.
I've been assisted by roadside assistance a few time. Always courteous, and careful, no complaints, but all you get is emergency assistance.
JMHO