I have used Good Sam VIP and they are good on claims, but they kept raising my rates until they got pricey. Progressive Direct has better rates. They beat VIP by $50/month. However, I have no experience with them on claims. Progressive is controversial as they give/donate money to far left wing causes. :dead:
I've got Good Sam (GMAC) and they have been pretty good so far (have not filed any claims though). Someone reported that they disallowed a claim as 'normal wear and tear', might want to search for previous threads on this topic.
I use http://www.explorerrv.com/, and my experience has been excellent. My rates haven't increased after three years, even after having to file a claim for damage to my RV. They had the lowest rates that I could find a few years ago, and are probably still the lowest. BTW, when I did have to file a claim, the process was very smooth and quick.