I've used the protect-a-tow for about 4 years towing a jeep liberty and currently a ford sport trac. It works as advertised and I recommend it.
Having said that, if traveling in a dusty area your toad will be dirty from the dust but no dings or scratches.
Also, I did have to replace the bungee cord once and last fall I had to replace the whole thing. Neither replacement was the fault of the product.
Bungee had to be replaced because I ran over a metal shelf(traffic didn't allow me to avoid it) that when it came out from under the MH cut the cord and put a gash in the toad bumper. Fortunately no damage to the underside of the MH.
Total replacement was because the material was torn. I use a 6" drop hitch and two or three times it has hit the ground after leaving a gas station. I should have put some padding on the bottom of the hitch but I'm not sure if even that would have helped.
BTW for rear exhaust generators there is an item you can attach to the exhaust that will keep the material away. I have one and it works. Not sure if there is one available for engine exhaust.
Formerly had 07 Neptune 36PDQ, ISB 325, Allison 2500, Source Trailing Arms and Ride Enhancement Kit, Demco KarKaddy 460SS.
Currently no Motorhome