Originally Posted by cpaulsen
I run mine up to 80 when towing on the rears and 65 when not towing.
I doubt you are running OEM tires unless you are running a 3/4 ton or 1 ton truck with Load Range E tires.
The OP has a Frontier so highly doubt he can be compared to your PSI's.
changing to a diffrent rated tires (load range) depends on what you are towing and seeing that you are towing a 19 foot ROO - I doubt you will need a heavier load range tires but for piece of mind - look at the side wall of the tire and see what weight they are rated for at what PSI to run them at - I usually run them a few pounds under the max when towing to allow for expansion.
You are going to get alot of diffrent opinions on this one.
the one thing you will notice is when you tow more with P rated tires and not LT's or a heavier load range you will notice the tread is going to wear out faster due to the extra weight.