The longer part of my story was the rubber valve stems I caught the "3rd" flat going down because I had the window open. Road Repair showed me the rubber valve stems failing.
I went right to a tire shop and had all the tires yanked off and steel valve stems put on before I continued on. Drove another 4 years on those very old tires and never had another problem.
I sometimes wonder reading these tire posts over the years if a chart could be drawn to show how many of the so-called bad tire blowouts had rubber valve stems vs steel stems and that those with rubber valve stems it really was a case of loosing air going flat to a blowout condition?
I know on mine when you looked at the tire, you would have bet the bank it was a bad tire. Only in my case I had 2 more on one trip that proved otherwise. And I had just had it in the shop and 'they' put the rubber valve stems on.
My blow out was on the duals, you are not going to feel those going flat....you feel it when it blows out.
My advice why replace all stems with steel valve stems? It's a whole lot cheaper than replacing your whole sewage bay, blades, pipes, and all. Cause that's where the tire blew into on my MH. :(