Wow, there are many threads in many forums on this subject. I've been trying to figure out what to do myself.
Here is what the majority are saying;
Take off those large rubber deflectors, they cause more rock damage than without them
Lot of people like the screens that go between the coach and toad and lay over or under the tow bar.
Some do like the soft hula skirts, at highway speeds they do blow back and up a fair amount.
Many many people use nothing and swear by it.
I decided to use a protective film on our toad. Wanted something very easy and that it is. We only have about 700 miles towing, I see no damage or impact areas to our film.
No easy or right answer