CDL glossary
Doubles/Triples
An add-on license for pulling more than one trailer where it's allowed. Some states and routes don't allow triple trailers.
What Doubles/Triples means
An add-on license for pulling more than one trailer where it's allowed. Some states and routes don't allow triple trailers.
How it affects a CDL decision
Doubles/triples endorsements relate to pulling multiple trailers where allowed.
Usefulness depends on state rules and carrier network; LTL and linehaul employers may value it more than general beginner fleets.
Common mistake to avoid
| Mistake | Better check |
|---|---|
| Adding the endorsement without local use. | Check whether nearby LTL, linehaul, or carrier networks actually use doubles or triples. |
Where it shows up
| Situation | Why it matters |
|---|---|
| Training | The term may affect license class, ELDT, school choice, or testing sequence. |
| Jobs | Employers may use the term in postings, endorsements, pay models, or route descriptions. |
| Contracts | The same term can change cost, repayment, reimbursement, job placement, or risk. |
Questions to ask
- Does Doubles/Triples apply to the CDL class, endorsement, or job I actually want?
- Which official source controls the requirement or definition in my state?
- Does this term change cost, testing, hiring eligibility, pay, home time, or contract risk?
- What proof should I keep before paying for training or accepting a job?
Why it matters
This term matters because CDL decisions are full of shorthand. Misunderstanding one term can lead to choosing the wrong training path, wrong endorsement, wrong pay assumption, or wrong job type.
Official sources and verification links
-
FMCSA CDL overview
Federal CDL overview and related licensing resources.