I don't have much to offer as far as the extended warranties go, but just wanted to say congrats on the RV purchase. We bought one a year ago, and have loved it. I did let the finance gal tack on an extended warranty, I don't have the folder with me currently to know the $$$ or even which company it is.
Good Sam is a good membership to buy for the 10% nightly discount if you are going to be staying in many parks that accept Good Sam. I cannot offer any info at all about their warranty program. I will say, if you have anything to do with Good Sam (and Camping World as they are the same company), pay real close attention to everything. In my experience, they are shady, especially when it comes to memberships, renewals, supposed benefits, etc. I receive mailings constantly with cards that are disguised as "new" or "replacements". Closer examination shows that it is simply an attempt by them to entice more "upgrade" fees. They also got me at the CW store one time. Early Saturday morning, they spew their normal crap at the checkout about "renew for this many years for this reduced price, plus get a $50 coupon..." Ok, fine..... I receive the new membership card in the mail a week later, and it says my membership now expires one year SOONER than it had when I walked into the store that morning. Wow, thanks! Great deal!