Cover fits fairly well. It has cut outs around the tower mounts that are secured with velcro. I bought the version that fits over the swim step. It has a cinch rope around the perimeter that can be tightend for a snug fit. It has some fleece material that protects the bow and windshield frame. Has straps that attached to the trailer to hold the whole thing down. With the cover tight, it doesn't require any additional poles to shed water.
With that being said, I wouldn't tow with it. I would be suspect of towing with ANY cover. I know there are some awesome covers out there, but I have seen too many cases of scratched gel coat or vinyl graphics. It seems that no matter how tight you get it, it still moves around. Not for me....