Personally, I don't think they are worth it. But, we got one on our current camper. So when we really had a problem after the first year, found out, the one thing we needed wasn't included. What was it? Paint!
If you get an extended warranty, make sure they include outside paint repair and repaint.
Our front cap started fading after the first year. Because the first year of bumper-to-bumper normal warranty was now over, the "extended" kicked in. No problem. Everyone agreed the front cap was fading, making bad spots and needed a repaint ... everyone agreed except the extended warranty. It was the ONLY exclusion.
My dealership negotiated with Keystone and we ended up getting it repainted. They paid for it. But we had to pay for the graphics replacement.
So, if you ARE going to get the extended warranty, make sure it covers paint too!
FYI, this is our second trailer we got an extended warranty with and we've never had to use it. My advise.... save your money and when something needs fixed after the first 1 year, just pay for it and forget it. The are in business to take your money ... not help you.