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When coupling a set of doubles, in what order are the units generally assembled?
- A.Couple the tractor to the front (first) semi-trailer, position the converter dolly, then couple the rear semi-trailer to the dolly
- B.Couple the rear trailer to the dolly first and push the whole set backward to the front trailer every time
- C.The order never matters for safety
- D.Attach both trailers to each other before involving the tractor
Correct answer
A. Couple the tractor to the front (first) semi-trailer, position the converter dolly, then couple the rear semi-trailer to the dolly
Why
Building the set from the front back keeps each step controllable and lets the driver inspect each connection as it is made. The standard sequence also keeps the dolly handling to a short, manageable move.
Manual topic: Combination Vehicles - Doubles and Triples · From the Combination Vehicles practice bank (CV-222).