Carlisle insists that the tire be inflated to sidewall pressure in order to validate the warranty. Those are "C" class tires
and should be just fine for your trailer. If you feel that your trailer is too light
for "C" class tires then you could switch to "B" class next time and run them at the 35 pound sidewall pressure. Depending on the weight
of your trailer that may actually be the correct choice. The correct tire , inflated properly will give the best service.
My 13Scamp is just a little heavy for the OEM "B"s, so we ran them tight until it was time to change, then we went with "C"s.
I have experienced my best service from Carlisle radials.