I've had extended warranties on my last two coaches and they've paid for themselves each time. That said, you're buying a brand new coach which come with a warranty. This means that isn't really a 3 yr warranty, it's only a two year warranty as the mfg warranty covers you the first year. So two years coverage for that kind of money is way too much. I would never buy an extended warranty on a brand new coach or car. If you're buying used, that's a different story as you have no idea how the coach was treated before you bought it.
Pass on the policies including the tire warranty. You probably won't find anyone along the Alaskan Hwy that will honor it anyway. They'll want cash up front and you can try to collect from your insurance company....Dennis