Before you go there, I would consider a "Protecta-Tow." We've gone through a variety of coaches, rock guards, and bras for our tow vehicles, and have never seen something like this that works so well, and is easy to set up. Go to
Protect-a-Tow . We used it for the first time from one end of California to the other, over the horrible roads we have here in California, and the toad was pristine when we got to our desitination after 2 days.