The strongest economy in decades drove big gains in 2018 for most, but not all, of the largest freight carriers in North America. Check out our 2019 Top 100 For-Hire Carrier rankings.

In a move that could signal increased consolidation among tank truck fleets, the owner of Heniff Transportation Systems announced the purchase of Miller Transporters, along with Miller Intermodal Logistics Solutions and other affiliated companies. Terms were not disclosed.

Heniff Transportation Systems said it acquired Horizon Tank Lines, a bulk chemical hauler based in Durham, North Carolina. Terms were not disclosed.