I have seen several coaches with a brush like barrier mounted along the length of the coach, on the underside, on both sides. One explanation I heard for this was that it reduced heat, exhaust and noise you might experience while sitting under the awning of your coach (.....of course on the ground).
I don't think it is too good looking, but if there is some real benefit to it, I would like to know. Makes the coach look like a big bug, a mechanical millipede or something.