Need help buying/negotiating travel trailer from dealer

A many thanks to all for your recommendations and advise. We pulled the trigger and got a 2015 Jayco Jay Feather 23MB

Dealer had it listed for $17,995 and we got an additional $300 off and an out the door price of $20,514 which included title, taxes, an equalizer 10K hitch and a Prodigy 2 brake controller.

We are excited to get out there and explore.

Now we need to decide on extended warranty and the dealer is trying to sell us Perma Plate clear coat protectant.

Anyone got any final feedback on this?