[bobbecky]

Don't have a dually, but do have the WeatherTech flaps front and rear. I remember reading some time back that the only problem with the flaps attached to the receiver hitch with some trucks is the exhaust. I think with Ford diesel exhaust that aim out the side, there isn't a problem. With GM and I'm not sure about Rams, but the exhaust aims more out the rear and will melt or burn the flap that is in line with the exhaust pipe. Just something to think about.