An enormous part of the industry consists of contracting owner/operators hauling client (third-party) trailers. That is true even of many of the "fleet-looking"

An enormous part of the industry consists of contracting owner/operators hauling client (third-party) trailers. That is true even of many of the "fleet-looking" tractors you see on the road; the "fleet" is more of a contracting agency for nominally independent operators than an actual fleet, and the livery just means that the trucker contracts with the agency (the truck itself is either driver-owned or is on a rent-to-own sort of arrangement that makes the "no payments until 2075!!!" furniture guys look good). Since most of the benefits (streamling, regenerative braking, etc.) can only occur in paired tractor/trailer rigs, it's only those outfits that own both ends that can implement much, and then only if they have no retirement sales in mind.