Re: What tire pressure? What load rating?
Put 90 pounds of air in a load range "B, C, or D" tire and you will have shrapnel in your face. 90 PSI goes ONLY into load range "E" tires of your size. The sidewall of the tire carries maximum tire inflation pressure. For trailers, inflate the tire to that pressure. The sidewall of the tire also indicates the maximum load the tire can handle. Multiply that number by 2 since you have two tires. A Load Range "E" tire is has a 1535# load rating. A Load Range "D" would be 1320# @ 70 PSI max which puts you right at the load you indicated. If your all up weight (trailer, boat, full of fuel, all of the gear, batteries, etc) is 2500# on a single axle trailer you need load range "E".