I just want to put out there I found something superior to both Coachnet and AAA. I have State Farm auto insurance, and for about $3 per month I added towing coverage (less than $40 per year). My fifth wheel is covered anytime I am towing it as well as any other trailer I might want to tow. That's right-ANY trailer.
The service comes with a 800 number to call just like the previously mentioned service, with similar limitations such as possibly no service provider available depending on location and they also like to tow to nearest service center.
The HUGE upside is if I can pay for my own tow such as with my CC, I can have it towed pretty much wherever I want, and call whomever I want, and as soon as I carry my receipt into my agents office they cut me a check to reimburse, no questions asked. This means for less than $40 a year I have coverage with ANY trailer from ANY tow/roadside assistance service and can tow to the service center of MY choice. This is a no brainer for me. I don't know what the other insurers provide but I believe Allstate offers similar coverage as well.
Just an FYI in case this option is available to anyone else as it is the best option I have found.