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corsairdriver,
Every single manufacturer makes a 13 foot sport cover with and without side rails. They range in price from $199 to as high as $600 depending on how fancy you get with the materials. Almost all of the covers use a drawstring to tighten the circumference and loops to tie the cover down to the trailer at 8-10 mounting points. These will make decent trailer covers if the boat is not subject to much rain as they come with no center poles to create a tent or tepee effect to shed the water before it pools and makes the cover sag or slip off. You can add 2 center poles using a snap install kit and this will improve the rain withstanding power. None of these covers will be really effective when trying to cover a boat in the water and they are difficult to use when trying to cover a boat on a shore station. I have gone thru 2 of these covers in 5 years when I had my last 13 foot sport as they tend to tear at the mounting points after the wind works on them at highway speeds when trailering. It is a little more money, but if you want a tight water resistant cover that can be used in the water, when trailering, or in any condition, than a custom made cover with poles that snaps to the sides of the boat is the only answer. It will require installing a few snaps on the side of your boat, but any canvas guy can make the cover with poles and install snaps where they are the least noticeable. The price should be between $700-$900, but it will probably be the only cover you ever buy.

Jim G.