Here's a couple of ideas:
Palacios RV is big on interior and exterior work in Phoenix. They started as an auto upholstery shop years ago and branched into major RV work.
https://palaciosupholstery.com/
Look up AZ Expert. He is a talented RV tech and has a popular YouTube channel. He has a shop but doesn't promote it by name, you have to email him.
You can email him:
[email protected]
Also, there is a National Indoor RV Center in Phoenix. They have a great reputation for repairs.
https://www.nirvc.com/
I don't think any of them are close to Fountain Hills.