I really wish I could trust service shops to do quality work, but it seems like it is prudent to inspect everything they do to make sure it was done correctly. That is why I have chosen a diesel service shop that not only has a good reputation (they service several local fleets including logging trucks, dump trucks, garbage trucks, etc.), but does not object to lending me a creeper and letting me follow the mechanic around under the rig and watching his every move. (I use the explanation/excuse that I'm trying to learn more about my motorhome's mechanisms and the proper maintenance thereof. This way the mechanic is comfortable and freely shares his advice and experience, and I do actually learn some useful tips as well.)