I bought a new boat and trailer about 40 years ago and it had 10" tires on it. I wanted a much larger tire for the trailer. The dealer convinced me to at least try the 10" tires. He told me to air them to 65 psi, much above their rated poundage. By doing so, they didn't have the flex you would have with a lower psi and they didn't build up any heat. I traveled 65 mph for years and never, NEVER had a tire problem or even a flat. And it was 160 miles, one way to the lake each weekend. Just keep the tires inflated to their max and they will work fine.