I found a web site that may help if you need repairs on the road and wish to find a place that can do the job right. Coach Care has more than 30 shops set up now and more will be added in future. It is like a one stop fix it center with trained technicians. From home page go to RV Service then Coach Care. Coach Care
We have a shop here in Tampa that we use. I see all types of motorhomes in shop for service work. This shop is part of Cummins group. You can call 888-769-3778 (24/7) to also find shops across the USA. They also have hookups if you need to spent night in shop due to parts. I do not know if they will work on tow units or not.