Being a woman, I'm very ambivalent about boat covers.

Sounds like a good idea to cover your boat for trailering, but then all the road crud gets all over the cover instead of the boat. And then how do you wash the boat cover? It certainly is not going to fit into my washing machine. And that crud on it is probably not going to come off even in a commercial machine if I take it to a laundromat.

And if you keep your cover on your boat under trees, where we are, the cover is going to get covered with tree droppings and mildew.
Again, how are you going to wash that cover?

Just seems to me (again, as the woman who is going to have to figure out how to wash the cover) that it is much easier to wash the crud off the boat than to wash the cover. (Unless you don't care whether you have a really ugly, dirty, greasy, oily cover on your boat as long as the boat itself is pristine.

In other words, a boat cover is just one more thing to wash.

Personally, I like the earlier idea of just slathering or spraying the boat with something that will keep the road stuff from sticking, so it's easy to wash at the other end of your trip.