This may sound over simplified, but the easiest way to avoid frustrations regarding dealer service departments is to avoid them. They're your absolute last line of defense.
Dealer frustrations are the number one reason people who enjoy their motor homes most eventually learn to do 99% of the necessary maintenance/repair work themselves. For those incidents where that's not possible, there are mobile techs. Unlike a dealer, you can schedule them to be there when it's convenient - FOR YOU! Not THEM, like a dealer works. That's my take anyway....
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake