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SESK: Stuff Everyone Should Know · sesk.info/cdl-endorsement-n-tank

Which CDL endorsement letter is for tank vehicles?

N, for tank vehicle.

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  1. T
  2. K
  3. N ✔

Why: N is the tank vehicle endorsement. T is doubles and triples, and K is a restriction meaning intrastate only, not an endorsement.

Huh, didn't know that: Liquid sloshing in a partly full tank, called surge, is why tankers have their own test.

The dad joke
What's a tanker's favorite dance? The slosh.
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References

Answer: N. N is the tank vehicle endorsement. T is doubles and triples, and K is a restriction meaning intrastate only, not an endorsement.

  1. 49 CFR 383.153 Information on the CLP and CDL documents (eCFR) www.ecfr.gov/current/title-49/section-383.153
    N for tank vehicle
    Checked 2026-10-10.

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