No issues so far. Tires are 1 year old Trail Express with about 1500 miles on them last year. Usually run at 65 MPH or less with perhaps 100 miles total between 65 and 75 MPH. Camper stored in our attached garage (stays above freezing, no UV) between trips.
But then we have an A-frame (single axle) which we typically weigh in at about 2600 lbs (3100 lb GVWR). For reasons not totally obvious to me, PUP and A-frame owners do not seem to suffer nearly as much from the "China bomb" syndrome.
Perhaps the single axle isn't nearly as hard on tires, or perhaps the smaller tire sizes have more reserve capacity built-in, or ....(fill in your own theory).
I do a visual inspection of the tires, and inflate to 50-53 PSI (depends on expected temps for trip) before each trip (2-4 days).
just my experiences
2014 Rockwood A122
2008 Hyundai Entourage (minivan) w/ Equal-i-zer 600/6000 WDH