There are RV technical schools but I know of no dealer that offers such classes. The schools I have heard of are tutition based.
I can tell you that I have a general knowledge background including some limited mechanics, carpentry and such.. (General auto care) but not a lot of it, I combined that with years of reading these forums and not get calls to HELP folks who need it here where I'm stuck about 200 miles south of Atlanta. or 50 miles from Florida. Not many issues I can not figure out after reading lots and lots of forum posts. but there are many jobs I can not do.. Either not enough skill, experience, or tools.