I would ask around how important a wheels PSI rating is .
When the dealer removes the tire from the wheel, see if the wheel has a psi rating stamped on it. Many trailer wheels have a psi rating.
Be guided by the dealer as to which rating tire 'C' 'D' 'E' to use , to match the wheel or at least come close enough to match the wheel.
Some say that later model wheels have higher psi ratings like 80#.
If that's the case then an 'E' will work . If not...I'm not sure if an 80# 'E' tire will work on a lower psi wheel , like 50# psi wheel .
I have been advised you can get away with a 'D' 65# tire on a 50# wheel .
However, if you lower the psi of that tire, you may lose some weight carrying capacity.
