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380 Posts
Pic's not working for me but if you're referring to the roof mount air deflector it won't help unless it's within a foot or two of the trailer. Really only helps for 5th wheels. A bumper pull will be 8+ feet behind the deflector so the air flow will go over the deflector and then drop and eddy in the space between, likely making your mpg worse. Even if you were able to manage a slight increase in mpgs it would take a long time to offset the cost of the deflector.
