Most RV dealerships aren't happy about servicing units sold elsewhere. The most unprofessional cussing, screaming, tantrum I've ever seen is when we first purchased our Bounder and had a roof leak. We bought it a dealer about a 12 hour drive away, mainly because our local Fleetwood dealer didn't handle Bounders. When we discovered the leak, I called the service department at our local dealership and they made an appointment. When I showed up for that appointment, the service manager had a come apart right there in front of me screaming at his staff as to why they would allowed me to schedule an appointment ahead of "their" customers. They finally did at least work on the roof leak, but didn't address some smaller warranty issues that I had to take it back to the dealer I bought it from for.
Warranty and service work is kind of hit or miss at a lot of dealerships, even for units purchased there. Search through the forums for tales of people who've had their RV at the dealership for repairs for weeks or months at a time.
Independent RV repair shops or mobile techs are probably the most responsive because service IS their business.
Once we had such a warm welcome at the local dealership and I got most of the initial issues resolved, we found a local independent shop that Fleetwood approved to perform warranty work. Not sure if they still do that, but it's worth checking.
Also worth noting that most coach warranties are of somewhat limited value. There's no such thing as a "bumper to bumper" warranty on an RV. Most new coaches are covered for "manufacturer defects" for 12 months. Engine and drive train are usually covered longer, but many dealerships don't do that type of work anyway. A lot of them will refer you to a truck shop for engine and transmission issues.
Current RV Information: 2018 Forrest River Salem Hemisphere 282RK
Previous RVs: 2004 Fleetwood Bounder 32W; 1999 Four Winds Five Thousand 21RB; 1986 Allegro Bay 27'