Thanks, Kanook and Bordercollie! I have never used Slime, but I have a can of it under the seat and a 12-volt inflator in my "possibles" bag, together with bungee straps, a hatchet, a machete, tow straps, rope, flashlight, etc.
The tires my RTV 1100 came with are the very aggressive tread offroad type, and seem to be very hard. Here where I live the only things that could possibly pierce a tire are sticks and sharp-ended branches left over from the recent tree-cutting in one of the leases where I hunt. You couldn't find a rock unless someone brought it from elsewhere! In Kodiak the sharp rocks and shale slabs would eat tires. I never had a flat with my Argo, but I had to replace all 6 tires even after relatively few hours because the flanges that allow an Argo to move in the water were all but gone. The replacement set I bought from the Argo dealer are much tougher than the original ones. On the sand and clay mud of southeastern Alabama they will last forever. I never drive the Argo on pavement because its skid-steering eats tires and loosens up the chains that transmit power from the transmission to the drive chains. And to tighten them is a beast of a job.