Most new campers have a 1 year "bumper to bumper" warranty. Plan a bunch of camping trips... if you camper lasts the season, it will probably be fine for years to come without an extended warranty.
Having said that... many people like the "piece of mind" that comes with a warranty. Bargain for the warranty! Don't pay the first thing the dealer says. Look around, call some other dealers, see if you can get a warranty over the internet.
I've done this when buying my last few vehicles. I still buy a warranty from my dealer, but I bargain them down after showing what I could get elsewhere.
Good luck!