Doubles & Triples (T) Endorsement
The T endorsement covers towing two or three trailers. It is a knowledge-only test focused on coupling, uncoupling, and managing trailer sway.
Overview
The T endorsement covers towing two or three trailers. It is a knowledge-only test focused on coupling, uncoupling, and managing trailer sway.
Who it is for
This guide is written for prospective and current commercial drivers who need a plain-English explanation of the rules, the testing process, and the day-to-day implications.
How to prepare
Study the official state CDL manual, take practice tests, and schedule both the written knowledge test and the in-vehicle skills test at your state DMV or third-party tester.
Build a requirement checklist
For Doubles & Triples (T) Endorsement, write down the license class, endorsements, restrictions, medical requirements, training steps, fees, and documents that apply in your state. Confirm each item with the state licensing agency before scheduling a test.
Common mistakes
Common problems include studying from an outdated manual, arriving without required identity or medical documents, testing in a vehicle that does not match the desired credential, and overlooking restrictions that may be placed on the license.
After the credential is issued
Check the printed class, endorsements, restrictions, expiration date, and name before leaving the licensing office. Keep employer qualification records current and report changes that the state or employer requires.
Use the guide on the road
Create a driver account for truck-safe navigation, load updates, and documents.
Frequently asked
How long does it take to get this credential?
Timing varies by state, training availability, required background checks, and test scheduling. Use your state licensing agency and the federal Training Provider Registry to build a current timeline.
Do I need a CDL school?
Since February 2022 the FMCSA Entry-Level Driver Training (ELDT) rule requires all new Class A and Class B applicants to complete training with a provider on the Training Provider Registry before taking the skills test.