My 1999 Bounder came with a spare. There was a tray under the back end of the coach with it tucked away. Nice because it didn't take up valuable storage space!
But I soon discovered my pneumatic impact gun (250 ft. lbs) wasn't big enough to break the lugnuts loose. Furthermore, I didn't have a jack with enough capacity to raise the rear corner of the vehicle. I needed to "re-clock" my dual wheels as the inside one had a hidden valve stem.
After that experience, I opted for roadside assistance. I still carry a compressor and a tire plug kit. Anything more, I'll call for help. While Bubba's shop might not have the tire I need, I can find most anything I need these days with a smart phone. And if we are well away from cell phone coverage, we'll hop in the lifeboat (Jeep), and go get what I need. YMMV.