Originally Posted by Rickflint
Is the correct conclusion?
I always hate to see this inflation vs speed topic come up, as it is always confusing to many people.
Lou explained it properly in his post #20.
You shouldn't exceed the MAXIMUM air pressure specified for the tire. Your load range D tires are maxed out at 65 PSI. That is the most air you should ever put in the tires.
If you put 65 PSI in the tires, you can always weigh the trailer to see how much load there is per tire, which requires you to weigh axles separate if you have more than one axle. This is another reason I hate to delve into the generalities of this, as each tire is not always carrying the same load, nor is each side of the trailer weighted the same. Each tire may be carrying different weights, thus need different air pressures to run over 65 mph. it's not always an equal thing.
IF you are running the max air pressure of 65 psi, but the actual load per tire would only require 55psi, then you can run 10 mph over 65 mph.
I've always just personally thought it was much easier for everyone to make sure they didn't overload their tires capabilities, air them to max pressure to assure they can carry the weight, and limit their speed to 65 mph or under to be sure......then worry about important things, like did you pack the bug spray and/or remember to close the garage door at the house.