Why a relative replaced some perfectly good Michelin Tires?

The Firestone-Ford Exploder situation led us to where we are today, IMHO; everyone scared of a lawsuit. In that case, a largish SUV had not-so-large tires for the weight involved, and careless, or unknowing drivers ran them low on air, and the wrecks resulted. Now fear of litigation is trumping good sense and good practices.

I recently had a pair of new tires installed on my main 3/4 ton truck and the tire dealer pumped all 4 tires (2 new, 2 old) all the way up to 80 psi before finishing. I just rolled my eyes, went around the corner, and lowered the pressures to where I have run them for about half a million miles, towing 4-6 tons most of the time. And then I ignore the dash warning display, like I have for the 43k miles since buying the truck. The tires have not changed, nor have the safe pressures.