One thing I always do, along with using RVServiceReviews, is to ask the RV parks office folks where I'm staying if they have personal experience with any shops or mobile techs. Also, I always check with my neighbors.
You will probably get several recommendations that way, sometimes conflicting recommendation, and it's best to listen to their stories and make your own judgement.
I was down at a park outside Orlando and it took more than a month to finally get a lead on a good shop. And they were great. Hopefully, you have that kind of time.
Good luck!