Mail Carriers know all about flats. Got 50 miles of gravel road on my route, so if I don't have a nail, it'll be a rock cut. Lots of flint around here, the road graders dragging on hard pan flakes off pieces like mini arrowheads. Blazer has a slow leak on it now, maybe I'll go out and plug it.... or maybe just air it up and get it patched tomorrow. Now that I got the Blazer instead of the Taurus that burned, I can get 6 ply tires, when the ones that were on it go.