I am working on my 2011 Apex trailer aerodynamic mods now. As a trailer owner I am here go tell you poor aerodynamic performance is a concern of mine. Base mpg in good conditions can be between 11 to 12 mpg. This limits traveling simply because of the fuel cost. Having the same trailer that could get 14 tp 15 mpg would be a real coup. I have built appliances to help push the air from the tow truck (F 150) up over the trailer but this is not enough. I am looking at front facia for the trailer to store air from hiting the front edges and to act as a gap filler. I am also looking at a 3 ft boat tail to reduce the wake area. See my aero mods for trailer towing post.
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