Missouri Tanker endorsement practice test
The N endorsement covers hauling liquids and gases in bulk, and Missouri adds it to your CDL on a written test alone — no skills test in a tank vehicle. The questions are conceptual: surge, outage, and why a tanker rolls at speeds a dry van shrugs off.
Entering a curve with a loaded tanker, you should:
The N endorsement in Missouri
You need it in Missouri for any vehicle with permanently or temporarily attached tanks where an individual container holds more than 119 gallons and total capacity reaches 1,000 gallons or more. Fuel tankers, milk and water trucks, and box trucks carrying large totes all cross that line.
Hauling hazardous liquids — gasoline, for example — means the combined X endorsement: tanker plus hazmat. That pulls in the federal TSA security threat assessment, so the DOR cannot issue the X until the background check clears, and the check takes far longer than either test.
Fees, scheduling and document requirements are set by Missouri. Confirm the current details with the DOR before you go.
What the tanker test covers
The questions come from the federal CDL manual, so the material is the same in Missouri as it is anywhere else. The full breakdown — what each section asks and the figures worth memorising — is on the tanker practice test guide. Everything on this page is the MO half of it.
Before any endorsement there is the written test everyone takes. The Missouri general knowledge practice test covers it, and the Missouri DOT physical page covers the medical certificate you cannot be licensed without.
Frequently asked
- Is there a skills test for the tanker endorsement in Missouri?
- No. The N endorsement is knowledge-only in every state, Missouri included — you pass the written test at the DOR and it is added to the licence.
- Do I need the N endorsement for a few drums of liquid?
- Only if an individual container exceeds 119 gallons and your total liquid capacity reaches 1,000 gallons. Below both thresholds Missouri does not require the tanker endorsement.