Just remember that if you use your INSURANCE company to tow your RV, it will probably be considered a "CLAIM" against your insurance record. With Good Sams, AAA, CoachNet, it is independent from your insurance company. If you want to add "claims" to your insurance record, which will probably affect your future rates, just to save a few bucks by not having a separate roadside assistance program, fine.
If you call your insurance company, and explain what happens when you have a $1000+ towing charge, ask them if it is counted as a claim. Most insurance companies are only thinking about a short, inexpensive, tow with an automobile.