We typically carry only one spare for the truck and one for the fifth wheel. Usually this is okay BUT last year after going through a construction zone south of Whitehorse, one of our truck tires collapsed near Rancheria. It was a goner. Put the spare on and thought we'd buy a new tire in Watson Lake to have another spare, but there wasn't a new tire of the right size available there, so we bought a different size used tire just to have a spare, in case we got another flat. Got home okay though. A few years ago we had another flat near Rancheria after driving through a construction zone only 3 km from Rancheria. On one of our trips to Inuvik, we had two flats. You never know so it just depends how well prepared you want to be.