Quote Originally Posted by paulrodbender View Post
Original tires were rated for 50psi max and you changed to a 65psi max tire, so you can't really go by what the trailer says. You'll be safe at different psi but I like to adjust the psi until you get a good ride on the trailer. With new tires, I like to start a little high and try them and then start lowering the psi until I'm happy. If she's performing good at 55psi, you're good.
Between 60 and 65PSI. Since the majority of trailer tire failures are due to underinflation, I keep mine within 5 PSI of the maximum pressure to get the max load handling. Also, there's less rolling resistance at higher inflation and that helps fuel economy.