Try a set Michelin passenger or LT, depending on load. Go down the road with confidence.
I run PT or LT tires on all my boat and lighter duty trailers, they ride smoother which to me translates to a better road ride on your boat. Just make sure the load rating on each tire is good. My experience with Carlisle they are hit or miss, some good some bad. Besides Michelin I have good luck with Yokohama and Toyos.