Re: best cover?
There is absolutely nothing wrong with towing with a cover on so long as it fits properly. You folks that are towing with covers that are whipping and flapping your boat clearly do not have a quality cover.
A properly fitted, tight, custom cover that snaps on to the boat, not using straps that go down to the trailer is the way to go.
They guy that made my cover for my other boat, just made my cover for my current boat. The material is a polyester coated canvas that makes Sunbrella look like a clean ex, fade resistant, mold/mildew resistant, breathable, waterproof/resistant, and I'll guarantee you I can tow at 75 mph into a 20 mph head wind and after 130 miles it will be as snug and tight as it was when I left the garage.
I've seen too many boat windshield blown out from rocks thrown up by semi trucks. Ever price a replacement windshield or part of a wind shield for your boat? An expensive cover is cheap comparatively speaking. And better fuel mileage.
Go to Topgunboatcovers.com