Rooftop drag reducing device

摘要: A roof top drag reducing device includes a lower base portion mounted to or formed integrally with the of truck for semi-trailers. An upper is selectively movably relative between first elevated operative position atop and second non-operative retracted generally forward below portion. The will be in its when trailer attached reduction air resistance over desired. position, when, example, several cabs are being towed transported together from one location another. If truck, can form ceiling sleeper compartment area significantly increase height area.