We've had AAA for 18 years. Before we had the RV option, the fuel pump in our tow vehicle failed. Our destination was about 80 miles away and there was a dealership we could take the van to there to fix the fuel pump (didn't need van while camping). AAA covered the tow for the van, but we had to pay for the tow of the camper. The driver "cut us a break" and only charged us $2/mile for the trailer.
With vehicles as large as Motorhomes, there is generally a hook-up charge as well as the mileage. If they have to drop the driveshaft, it could be a costly hook-up charge, more than the tow itself.
We recently had a blow out on our Motorhome, back in March. It took AAA some time to find a mobile tire repairman, but when he came out he did the job in 20 minutes (it was an inner rear tire). He charged AAA $250 to put our spare on. AAA Plus with RV and 2 drivers cost $185/year. It's more expensive than the others, but it covers any vehicle that my wife or I are in, not just vehicles we own. I've used it for friends and family in the past without an issue. Plus, lots of retail stores, restaurants, campgrounds, hotels, etc. offer AAA discounts that often adds up to enough to pay for the coverage.
-Michael