Practice question What does a gentle tug test help confirm? The trailer is securely coupledCargo is legal weightThe ABS lamp is burned outTriples are legal on the route Answer: A — The trailer is securely coupled The correct answer is shown above. Try the full quiz for additional practice. Practice more: Washington CDL Doubles and Triples Endorsement Test Practice Questions - Washington CDL Doubles and Triples Endorsement Test Exam →