It's been over $110 an hour here in the Lehigh Valley for a long time, and we are not as expensive as what you'll pay closer to Philadelphia or NYC. Agree with earlier reply to your post in that if the hourly rate is high but the work is first-class I'd much rather pay the higher rate.
Also, as said earlier RV shops have to be able to tackle a broad range of issues related to RV appliances, etc. that a typical auto shop doesn't, so generalizing by saying "how much technical know-how could there be" will likely be taken as an insult to an RV tech. JMHO