mobil RV service in San Fernando Valley

Not mobile, but I am using On Time Auto in Saugus, on Railroad across from the Saugus Café. 661-255-2896. They are Cummings Certified and the RV access is easy. I had my first annual service there, my appointment was 8am, they took me right in and called that I was finished around noon. If you really want mobile, I used to use Jim Frankle who operated Mobile RV Repair. 818-445-6738 He was in Woodland Hills. He did both body and engine repair on my Adventurer, which was a Workhorse gas.
Good luck.