Anyone make a mistake buying first MH ?

My first motorhome was a superior that had a lot wrong with it. I learned a lot. It had a 413 H and needed new points had to boil the radiator and had to replace a lot of hoses and wires. but it ran great great after that It was only a 22 foot class A I have gotten into buses and learned a lot when I got into those a whole other can of worms to deal with diesel engines huge transmissions air systems air brakes etc. then went and got a Holiday rambler. 1984 with a great engine and tranny and a worn out house both ac units shot bad plumbing leaks bad pump bad toilet as the previous owner lived in it with wife and 4 kids for 9 months. fixed a lot of that. I learned a lot about fixing the coach or house whichever you call it. now i have a 1979 Dodge Avcvo that has a great coach everything works . but needs a carb. so I made a lot of mistakes but learned so so so much. my problem is I can't buy a new RV but I still want one and I have to get old used ones. one other thing. I feel if you insist on gas. go with a high end class C these class As are too big for smaller modern gas engines and the v-10 is a guzzler. If you go big go diesel.. if you have a more limited budget, go used. Mistakes are a great teacher make a few it's good for you.