AeroTabs
The Aerotabs on the back of the RumRunner didn't make a noticeable change on the fuel mileage, as I had hoped, but what it really did is cut down considerably (BIG TIME!) on the buffeting when passing other trucks or meeting big trucks, vans etc. It also helps to keep the back ot the RV much cleaner which is always a good thing too!
AeroTab sells them as a kit for around 240 dollars which comes with like 80 tabs. they also work good up front on your fenders or around windows to cut down on wind noise.
I'd buy them again, even if they didn't help my mpg.
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2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio
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