A doubles endorsement lets you haul two trailers behind a single tractor; a triples endorsement lets you haul three

A doubles endorsement is a notation on your commercial driver's license (CDL) that permits you to tow two trailers at once — typically a 28-foot or 33-foot trailer paired with a second 28-foot trailer. A triples endorsement allows you to tow three trailers under the same conditions. Without one of these endorsements, your CDL restricts you to hauling a single trailer, even if your truck and training would otherwise allow it.

These endorsements are issued by your state's Department of Motor Vehicles or equivalent licensing body. They appear as a code on your CDL card — usually "2" for doubles and "3" for triples — and are only available to drivers who hold a valid Class A CDL. You cannot get a doubles or triples endorsement with a Class B or Class C license.

The endorsement itself does not change how you drive or what you own. It straightforward removes the legal restriction that would otherwise prevent you from operating those vehicle combinations on public roads. Many trucking companies require one or both endorsements as a condition of employment in certain roles.

Key Takeaways

  • Doubles and triples endorsements are only available to drivers who already hold a Class A CDL and meet your state's age and experience requirements.
  • You must pass a written knowledge test specific to doubles or triples operations before the endorsement is added to your license.
  • Some states require a skills test (backing, coupling, or road test) in addition to the written exam; others do not.
  • The endorsement costs vary by state but typically range from $10 to $50 as an additional fee on top of your CDL renewal or amendment.
  • Once issued, the endorsement remains valid for the same period as your CDL — usually five or eight years depending on your state.

Who can get a doubles or triples endorsement

You must hold a valid Class A CDL before you can pursue either endorsement. Class B and Class C CDL holders are not permitted to add these endorsements, regardless of their experience or training. Your state may also impose a minimum age requirement — most require you to be at least 18 years old, though some states set the minimum at 21 for interstate commerce.

Some states require proof of a minimum amount of driving experience before you can test for the endorsement. This might be 6 months, 12 months, or longer of documented Class A CDL driving. Check your state's specific rules, as they vary. You will also need to pass a background check and have a valid medical certificate on file with the DMV.

The written knowledge test for doubles and triples

Every state requires you to pass a written test before the endorsement is added to your license. The test covers the mechanics of coupling and uncoupling trailers, weight distribution, braking systems specific to multi-trailer rigs, and safe operating procedures for the combination you are seeking to drive. The test is typically 20 to 30 questions and you must usually score 80 percent or higher to pass.

You can study using your state's CDL manual, which includes a section dedicated to doubles and triples operations. Many states also offer sample tests online or through the DMV website so you can practice before you sit for the real exam. The written test is administered at your local DMV office and costs nothing beyond any state fee for the endorsement itself.

Skills testing requirements vary by state

Some states require a skills test — a practical demonstration of your ability to back up, couple trailers, or operate the vehicle combination on the road — before issuing the endorsement. Other states issue the endorsement based on the written test alone. A few states offer a middle ground: they waive the skills test if you can show proof that you have already passed a skills test for doubles or triples through a certified training program.

If your state does require a skills test, it is typically conducted by a DMV examiner or an approved third-party testing facility. The test usually includes a pre-trip inspection, coupling and uncoupling, backing maneuvers, and a road test. You will need to bring your own vehicle or arrange to use one provided by a training school. The cost of a skills test, if required, is separate from the endorsement fee and varies by state.

Cost and processing time

The endorsement fee ranges from $10 to $50 depending on your state, and is usually added to your CDL renewal or amendment fee. Some states charge a flat rate; others charge per endorsement, so adding both doubles and triples would cost more than adding one. A few states include the endorsement at no additional cost if you pass the written test.

Processing time is typically one to two weeks if you pass the written test and no skills test is required. If a skills test is required, you may need to schedule an appointment, which could add another week or two. Once approved, the endorsement is printed on your new CDL card or added as a notation to your existing card, depending on your state's procedures.

How the endorsement appears on your license

On your CDL card, the endorsement will appear in the "Endorsements" field, usually shown as a letter or number code. Doubles is typically coded as "2" and triples as "3." If you hold both endorsements, both codes will appear. The endorsement is visible to law enforcement during a traffic stop and to your employer when they verify your license status.

The endorsement is tied to your CDL class and any other endorsements you hold. If your CDL is suspended or revoked, the doubles or triples endorsement is suspended or revoked along with it. If you let your CDL expire, you will need to renew your CDL and may need to renew the endorsement as well, depending on your state's rules.

Renewing or removing the endorsement

When you renew your CDL, the doubles or triples endorsement renews automatically in most states, provided you continue to meet the requirements and have no disqualifying violations. You do not need to retake the written test unless your state specifically requires it as part of the renewal process — most do not.

If you want to remove the endorsement from your license, you can request an amendment at your local DMV office. There is usually no fee to remove an endorsement. You might do this if you change jobs and no longer need to haul multiple trailers, or if you want to simplify your license. Removing the endorsement does not affect your Class A CDL status.

Frequently Asked Questions

Do I need a doubles or triples endorsement if I only haul one trailer sometimes?

Yes. If you operate a doubles or triples combination at any time, you must have the appropriate endorsement. Operating the combination without the endorsement is a violation and can result in fines, points on your record, and potential license suspension. The endorsement is required every time you haul that configuration, not just when you choose to.

Can I get a doubles endorsement and then upgrade to triples later?

Yes. You can add the doubles endorsement first, then test for triples separately at a later date. Many drivers do this because the written tests are independent — passing the doubles test does not automatically grant you the triples endorsement. You will need to pass the triples written test and any required skills test to add that endorsement.

What happens if I get a traffic violation while driving with a doubles or triples endorsement?

A traffic violation does not automatically remove the endorsement, but certain violations — such as reckless driving, DUI, or at-fault accidents — can lead to CDL disqualification or suspension. If your CDL is suspended, the endorsement is suspended with it. Once your CDL is reinstated, the endorsement remains on your license unless you specifically request its removal.

Do I need to renew my doubles or triples endorsement separately from my CDL?

No. The endorsement renews with your CDL on the same schedule — typically every five or eight years, depending on your state. You do not pay a separate renewal fee for the endorsement; it is included in your CDL renewal fee. Some states may require you to pass the written test again at renewal, but most do not.

What if I fail the written test for doubles or triples?

You can retake the test. Most states allow you to retake it when ready or after a waiting period of a few days. There is usually no additional fee for retaking the test beyond the original endorsement fee. You can take the test as many times as needed until you pass.