As far as the Lund Razorback...
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Attaches to truck bed to extend cab line and acts as a sun shade. Gives an aerodynamic racing look to all pickups.
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A look won't do squat fer you in the long run. It would be like slapping a turbo sticker on the fender and it automatically gives you 50 extra HP.
As any spoiler design...the vehicle it's going on will determine the best angle/approach. When I put my rainguard (ducktail) on as a basis to keep rain/water from running down in between the cab window and the camper top window, it did it's job admirably. When I took the camper top off and left the ducktail on...I got some really nice MPGs out of just that alone. Tests show that it's not supposed to work but it did in my case. Not sure why...but I got mileage just as good (if not better than) when my camper top was on. Sure it was only one trip (2 tanks) but based on my previous trips with the camper top on...it was as good if not better. All my ducktail was made from was a single sheet of Coroplast that I taped to the top of my cab.
