Interesting information, Paula. Thanks for posting. It does sound very similar to GS coverage, and price. I went to their site and found the Airstream press release that was linked at the bottom of the page. Here is a statement from the press release:
"Through its Coach-Net line of services, NMC has served the RV industry for the last 25 years and is included with vehicle purchase in 70% of all new RV models."
NMC | Roadside Assistance - RV Plans
I may have taken it out of context, but I'm a bit surprised AS wasn't already among that 70%.