I don't know how far your research has taken you but I found this from RVServiceReviews.com:
Bear Automotive & RV Services, Inc. Grand Junction, CO Class A - Gasoline Very Good (2 reviews) Add review
Cummins Rocky Mountain Grand Junction, CO Class A - Diesel, Class C, Medium Duty Truck Fair (2 reviews) Add review
David Fritzlan's Mobile RV Grand Junction, CO Class A - Diesel, Class A - Gasoline Very Good (2 reviews) Add review
Fast & Easy Services Grand Junction, CO Class A - Gasoline Excellent (1 review) Add review
Humphrey RV & Trailer Grand Junction, CO Class A - Diesel, Class C, Toad, Travel Trailer Excellent (6 reviews) Add review
PDF Automotive Repair Grand Junction, CO Class A - Gasoline Very Good (1 review) Add review
Transwest Freightliner Grand Junction, CO Class A - Diesel, Pop-up Trailer Very Good (5 reviews) Add review