Instruction: To obtain this endorsement for pulling two or three trailers, applicants must pass a 15-question test. And to pass the test, applicants must score at least 80%. Test questions are from the SD CDL Handbook. The Double/Triple trailers endorsement can be used with the Class A CDL. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at South Dakota DMV locations.
1. What are hose couplers?
This mounting style coupler locks on by sliding into the round shank tongue and welds on it.
It's used for A-shaped tongues and it’s made to withstand heavy duty towing.
A hose coupling is a piece of equipment used to connect a hose with something else, like a tap, sprinkler, pump or another hose.
This is a style for the straight tongue and it’s the most basic one.