Many trailer tires are rated for 65MPH; you need to inflate them more if you intend to go faster. However, trailer tires are built for campers, etc, not just boat and similar trailers. Anyone know any reason why a regular automotive radial tire shouldn't be used on a boat trailer? Seems to me they're rated for higher speeds, and Lord knows the prices on some of these trailer tires are just as high or higher than a regular tire.