Even the tire warranty sounds iffy. We put over 100,000 miles on our first motorhome with the only tire troubles being that they wore out. We've also been to Alaska a couple times and up and down the west coast. There was never a problem with a tire. For the tires you'd be far better off to carry an unmounted spare and have a road service. The tire and road service would cost far less than the price they're asking and you would be assured you had a matching tire of the proper size if anything did go wrong.
As for the other warranties I wouldn't even consider them. All the things they cover are covered by the coach builder or the original manufacturer for a period of time. The add on warranty will only go into affect once the originals are expired. So if your refrigerator dies at 11 months the manufacturers warranty will cover it not the extended insurance. The so called warranty plans actually give you far less coverage than advertised. If you buy a 3 year plan you'll only get 2 years of coverage if the warrantied item has a manufacturers 1 year warranty.