My first thought was the same. That's a lot of money. Some details to check would be exactly what's covered, and if you have to return it to them annually for an "inspection" that you pay for, or the warranty is void? Are there parts or systems that are an exception and not covered? Does it include the chassis, or not? If you don't use it, will you get a refund from them?
Some folks prefer to get one, but I'm not one to accept. The Jayco warranty, plus registering all the inside components and appliances with the manufacturer was good enough for us. Never had to use any of them, maybe we were just lucky.
Jus my .01 worth.