skintback,,some people use car tires on boat trailers BUT,, I do not... There is a difference,,,the side walls are stronger on trailer tires and they are rated for heavier weight per tire..and higher inflation pressures..ST printed on the tire = special trailer,,,I was told this by a friend that owns a tire store,,if I rememder correct..
I guess it depends on how much weight the trailer carries and some one else may chime in and correct me if I am wrong.. captin