I had my best luck with Don Palen who has his own mobile tech service called "At Your Service" His shop is in Vancouver but he used to come out to Tualatin and work on my rig. I found him honest, dependable, and he warrantees his work. Try him at 1-800-767-8865. He'll come to your location.
I don't have any connection with him, I'm just a satisfied customer.
2004 Winnebago Vectra 40AD
2004 Jeep Grand Cherokee Ltd