Yes, the trailer has light truck tyers on it. I have been running 40psi in my car tyres for years. I currently have bridgestone a/t duelers on at the moment. They have done 30,000kms, and still look new. It got recommended to me to run that much, even I was a bit iffy at first, but the ride and handling is much better. But I was not sure abnout the boat trailer. It says on the side that the max load is 595kg's at 65psi......