I have to differ with the previous responses. I have a 2002 Popular on a Chev chassis, and only take my Roadtrek to a Chev/GMC dealer for chassis related repairs, and have never had a problem. They built the original chassis and they still service it for me, as if it just rolled off the line. For the RV stuff, if I can't figure it out myself, it goes to the nearest Roadtrek authorized dealer, unless it's an appliance or other proprietary piece of equipment. I would take it to a Cummins repair shop for my generator, etc......
It's not a sprint(er) (unless you make it one), it's (hopefully) a marathon.
RV - 2018 Navion 24V + 2016 Wrangler JKU