As far as roadside assistance and towing, I think a recent experience would be helpful. Our old RV (an Itasca Reyo) was a Sprinter based RV. We started having engine problems on our last trip out to Utah. At first, it would stall only when the engine was cold. By the end of the trip it was stalling almost any time you'd come to a stop.
Once we made it out there and got settled in, we took it to the nearest place that could diagnose the issue. That was 90 miles away. (Did I mention that our place in Utah is in the middle of nowhere?
) They discovered that the pressure regulator was probably the issue, but didn't have the specialized equipment to be sure. So, after talking to a lot of people, it was decided that the closest place that could fix it was a Mercedes dealership--250 miles away.
We had Good Sam roadside assistance--so we called them. They basically kept wanting to taking somewhere closer than the Mercedes dealership. First they wanted to take it to some mechanic who worked out of his house. Then they wanted to tow it to Dodge dealership (because Dodge sold Sprinter vans years ago). We called each of the place they wanted it towed to and they all said they couldn't fix it. This covered multiple days and way to many phone calls.
We were fed up and called our State Farm agent (who we have the insurance on the RV). They said that they would cover any distance and amount based on if the RV was undriveable--which it wasn't at that point.
We had it towed to the Mercedes dealership. It was almost $1400. State Farm reimbursed us about a week later.
So, keep your insurance company in mind when thinking about roadside assistance. You might already be paying for it!