LR-C= 50psi, LR-D=65psi, LR-E=80psi. I do not recommend the use of P series tires on any trailer as they are only 2 ply in the side walls. ST & LT series tires are 4 ply side walls. Check the date codes on the side wall of each tire, if they are 6-8 years old or more get rid of them. Google tire date codes for the info on decoding the date code. 3500 lb. trailer should be running at least a load range C. 5000-7000 lb. trailer should be running at least load range D, 7000 - 10,000 lb. trailer should be on at least load range E.
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