Question When coupling a triple trailer rig: Answers The trailer immediately behind the cab should be coupled first. The rear trailer should be coupled first. The lightest trailer should be coupled first. The order in which trailers are coupled is not important. Explanation When coupling a triple trailer rig, you should first couple the trailer immediately behind the cab. Connect the second and third converter dollies and trailers in order. Take a FREE Practice Test Now This questions appears in the following tests: Pennsylvania Double ,