The Trail Express used on my last Crossroads lasted about 2.5 yrs and probably 5k miles. While having steel stems installed for a TPMS it was noted that one had tread separation. I replaced all 4 as we were leaving in less than a month for a 3k mile trip.
I don't know the date code but they had been maintained at 80 PSI and the trailer tires were carrying 7800 lbs total by the scales. The weight is well within reason as they were rated at over 3500 each for 14k for 2 axles. Abt 55%.