DrewE wrote:
The aerodynamics of vehicles with flat, squared-off backs are such that the air swirls around back there and dust and stuff is all stirred up and some collects on the vehicle. I don't think there's much you can do to eliminate it.
One very good way to eliminate that swirling wind to install
Air Tabs That is what they are
designed to do, the partial vacuum is reduced. There is less accumulation of road grime.
I put them on my Class C and the bikes and the rear of the RV stays very clean.
They have not really helped in the fuel mileage but the stability in cross winds and the turbulence created by passing trucks has been very good,handling has greatly improved and the cleanliness of the rear of the RV is a real plus.