Fifth wheel coverage, no idea since I own a Class A. Comparing Class A to a car will vary greatly and any numbers an owner posts will not be of much use without personal details such as - declared usage (full time, snowbird, weekender), estimate value of a coach, owner declared residents, drive record of principal and secondary drivers, coverage level selected, credit score of owner,,,.
A better question to ask would be what company insures a rig and if you had a claim how was the customer service provided associated with the claim. You could have the lowest rates available but if a service provider takes months to process a claim is really worth the cost savings?