If you tell the forum where you live you will no doubt get some recommendations from RVers familiar with your area in general. Welcome to the forum....... BankShot........(aka Terry)
Like Bankshot says, we might be able to give you some reccomendations, if you let us know what part of the country you reside, and what chassis you have on your coach. It makes a big difference if you are a gas or diesel engine too. Ones to avoid would be RV specific places, and dealers, as they are generally more expensive than regular repair shops.