I wasn't planning on carrying a mounted spare or even just the tire. I looked under my truck to see if there is even room, and there is, but it's not ideal. I have purchased roadside assistance from Coachnet:
NMC | Roadside Assistance - RV Plans
You have me thinking about the matching tire issue, and also the possible cost of getting gouged on the road when they know they've got me by the short hairs. I am not sure how far I want to go down the path of being able to replace a tire myself. It's something to think about though....