In 14 years of full timing, I've broken down several times. Tires, blown engine, engine dies while at speed, overheating, funny noises, etc..
In every case, if I just didn't panic, I could usually limp to a location where I could either call my roadside service (Coachnet) or a mobile tech. Or fix it myself. Many times my problems were much more simple than I'd first imagined. There was the one issue that no solution was ever found for an intermittent starting problem, tho several techs looked at it.
Nothing that ever happened caused me to be off the road for long...except the blown engine. Where I had to stay in motel rooms for a couple weeks.
And I've traveled all over the US, Mexico, and several times up and back from Alaska.
I do have a diesel Class A though. These are built on a strong truck chassis and tend to stay on the road.
Speaking of limping...many RV engines & trannis from the late '90s on have a 'Limp' mode so you can limp back into town if need be.
Finally, once I've limped to a RV park, and paid for several days or a week or months stay, then I immediately start checking for local RV repair sources doing online searches. I even check Craigslist. And I always, always check reviews for shops on RVServiceReviews.com. And I never go to Camping World for service.