Coachnet and Good Sams are not a diagnostic or repair service, they are roadside emergency. I.E. your truck breaks down, they tow you to a repair facility, you experience a flat tire or blowout while traveling, they send someone out to change your tire, you run out of fuel, they send out someone with fuel to get you to a station, you lose an axle on your trailer, they send out a flatbed to haul your trailer to a repair facility, etc.
The don’t fix propane systems, they don’t diagnose brakes systems, they’re not going to fix a broken refrigerator, and if that’s what you think you’re getting with an emergency roadside service you are going to be extremely disappointed no matter who you go with.
You need to get online and look at the exact services offered by Coachnet.