I guess we are in the minority on this discussion. We have purchased an extended warranty on every car, RV we have purchased. And we have used those warranties on every vehicle. Example, in route to Maine a few years a go, towing a Airstream with our Suburban, the "burbs" a/c went our less than 500 mi out of the state. Found a Chevy dealer, they replaced the a/c, and in a few hours we were back on the road with $50 deductible. That policy more than paid for itself with one problem!
We have used ext. warranties on our Airstream, Forest River Lexington and our new Winnebago is still under warranty, but somewhere down the line, I know we will more than likely use it too. We have always negotiated with the dealer on our warranties and wanted to know in advance what the coverage is, etc. Yes the dealer makes money on them, they are negotiable, we always start by saying we want to check around for the best warranty. I can understand why many people don't believe in them, but in our experience, just a problem (or two) can pay for the warranty. We haven't had a problem finding someone to accept the warranties we've had….but do your homework.
Safe travels.
Andi