Hello Oliver tire experts, Gary with hull 994 here. The old tires were at there expiration so I took off the 4 tires and brought them to discount tire and dropped them off. I had bought in advanced 4 new tires. They called me and said some that there was a mix up with the order, but they had 4 compatible ones. ( This was last fall and has not been on the road yet). So I told them to mount up the new ones, Good year endurance ST 235/80r16 Trailer tires. The Question is they are supposed to be 80 PSI, can I run a lower PSI like 55 or 60. I can not find anything on the google machine that supports a lower PSI. Did I get robbed on these tires and have to deal with the rock pounding they will produce. I also have the 4 ALCAN springs ready to go on when the Minnesota weather lets me.