Minnesota Doubles & triples practice test
The T endorsement lets a Class A driver in Minnesota pull two or three trailers. It is a written test only — converter dollies, coupling order, and why the last trailer in the set is the one that tips over.
When coupling the second trailer using a converter dolly, the trailer height should be:
Doubles, triples and Minnesota law
This is the one endorsement where the state matters more than the test. The endorsement itself is federal and the Minnesota Driver and Vehicle Services will add it on a passing knowledge test — but where you may actually pull a set is state law. Many states prohibit triples entirely, and several limit doubles by length or route.
So confirm with the DVS, and with the states you run through, before you count on the work. Holding the T endorsement is not the same as being allowed to use it on a given road.
Fees, scheduling and document requirements are set by Minnesota. Confirm the current details with the DVS before you go.
What the doubles/triples test covers
The questions come from the federal CDL manual, so the material is the same in Minnesota as it is anywhere else. The full breakdown — what each section asks and the figures worth memorising — is on the doubles/triples practice test guide. Everything on this page is the MN half of it.
Before any endorsement there is the written test everyone takes. The Minnesota general knowledge practice test covers it, and the Minnesota DOT physical page covers the medical certificate you cannot be licensed without.
Frequently asked
- Can I pull triples in Minnesota?
- The endorsement is federal; the permission is not. Many states prohibit triple trailers outright and others restrict them to specific routes or lengths, so check the current rule with the DVS rather than assuming the endorsement settles it.
- Do I need a Class A CDL first?
- Yes. Doubles/triples is an add-on to a Class A licence — combination vehicles knowledge is assumed, and the T test extends it to what changes with a second and third trailer.