I installed about 80 on my Teton and one thing I noticed, brought to my attention from a buddy following me, there is a lot less turbulance behind. It does seem to slip through the air a little cleaner and the milage seems to be about 1/2 mile better. Still I get the road grime on the ledge the Teton has just below the window. I was hoping that would go away. It's still there. I installed across the top, down the sides, and under the rear cap. 5 on the heat pump up top.
To me the big difference I see is a more stable tow.
Maybe someone who know's these things( designed) will see this and let us know how to use um.
. . Preston. .