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They do help, especially with fifth wheels. The problem is 1. they're difficult to remove when you aren't towing (and look kinda dorky when not towing) and 2. every one I've seen has been hit at least once because whoever is still building them hasn't taken into account the changes that have happened with trucks and RVs over the years. My FIL had one on his last F450, and we had to rebuild the entire support structure to move the air dam forward about 8 inches just to make it clear the camper by about 2 inches when cornering.We always got better mpg with a roof wind deflector on. You never see those anymore. Added bonus, no bugs on the front of the trailer.