Breakdowns suck and thats all there is to it,you'll need an emergency fund tucked away,get it checked from stem to stern by someone YOU trust and no band-aids,that "if it ain't broke,don't fix it" attitude is ok on the homestead but out on the road it's a totally different matter,you'll need to think "preventive maintenence"! With all that being said i travelled with my family for twelve years in a 32' Mallard A-Class (built by fleetwood,a total P.O.S. manufacturer)

without a hitch,it was built on a P30 Chevy chassis

and i was able with help from a buddy who is an expert mechanic,sons who are welders/half azzed McGuiver's and my abilities as a master carpenter to upgrade and maintain it so i had a safe,reliable rig and put a lot of miles on it so if your up to doing that you should be ok!
Good luck!!