Personally I’m of the school that a cover no matter how good and no matter how tight will scratch a boat over time. I do 90% of my towing without. The exceptions I have are in winter, I always tow with my cover, because I don’t like salt in my boat, and a clean windshield, but the thought of it getting up and under the cover and between the cover and boat, worries me a bit.
There are a couple products out there for care of your boat too, I’ve been using a product called Bass Boat Saver, it’s a cleaner wax and polish, works really nice to clean and apply a light layer of wax on the boat, suppose to UV protect the Colors too. There are other products out there too, I’ve heard really good reviews of a product sold by a guy on Walleye central too, that people seem to really like. I like to use something like this and wipe the boat down after being on the water, takes like 5 minutes, and keeps and makes the boat look really nice and sparkly again . A little time goes a long way.
A keel guard is a very good reccomendation and money well spent if you don’t have one already.
On the trailer end of things, the tire stuff that makes tires look all nice and shiney does really nice things to the Coating on the Ranger trailer, makes it looks fantastic and new, beware it makes it slippery and there’s not a chance in heck that those little invasive species stickers the DNR hands out will never stick.
Towtector