I have had a 2000 37 foot gas class a with v10 and 40000 miles, a 2009 43 foot diesel pusher with 40000 miles and now a gas 2015 class c. I have also had a small travel trailer towed behind a 2001 gas truck I drove for 20000 miles together
I have been broken down a total of 0 times with the gas class a, 6 times with the diesel class a, 0 times with the new class c, and zero times with the gas powered truck with trailer.
Take this info and do what you want to with it. I have never even been in the shop with any of my gas vehicles beyond normal maintenence. My diesel lived in the shop and racked up $40000 in warranty work in 4.5 years.