Want to drive combination vehicles with two or even three trailers or semi-trailers? You must obtain a Class A CDL (including passing the Combination knowledge test) and a Double/Triple (T) endorsement on your Class A CDL.
Is the T endorsement worth getting? Consider that the limited number of drivers with this endorsement and their specialized skills and additional responsibilities place them in high demand.
In Arkansas, the logistics sector (e.g., J.B. Hunt Transport Services, ABF Freight, FedEx Freight, and UPS Freight) relies heavily on double trailers for freight transportation. So does the retail and E-commerce sector (e.g., Amazon Fulfillment Centers and Walmart Supply Chain).
As of early 2025, drivers qualified to pull doubles or triples were earning $10,000 to $25,000 more per year nationwide than drivers of single-trailer vehicles, depending on the trailer configuration (Double Pup, Rocky Mountain Double, etc.).
To obtain the Double/Triple endorsement, you must pass the Double/Triple knowledge test. This test covers such topics as safe handling, air brakes on doubles and triples, coupling and uncoupling, pre-trip inspections, rollovers, and trailer sway. (Note that no special skills test is required for this endorsement.)