The wait times at the dealer where we purchased ours are horrendous. I have no proof of this, but I think we get put ahead in the line because we purchased our trailer there, vs someone who purchased it elsewhere. But, it's the case all over the Denver Metro.... too many people, not enough services, so wait times for everything are long, not just RV repairs.
We end up using a mobile RV tech most of the time. He costs a bit more than the dealer does, but he can get here faster, and we don't have to hook it up and haul it a half hour up the road to have it sit there for a month. And this year, he taught us how to winterize it ourselves (Yes I know you can YouTube it but there's something to be said for someone showing you in person).