I am just completing a 7500 mile trip in my new Fifth wheel that has the Goodyear Marathon tires owas passed by scores of other units.n it. I have had no problems with the tires but after driving all...
The flaw with that theory is plenty of folks that do stay within the ST 65mph limit still have blow outs as attested to on the Forum.
It is good that you haven't had a problem in 7,500 miles, but it's a little like Russian Roulette with an ST tire. Best thing you can do for yourself now is replace them before you take another trip.