When uncoupling a triple trailer rig: Question When uncoupling a triple trailer rig: Answers The second trailer should be uncoupled first. The third trailer should be uncoupled first. The order of uncoupling is not important. The heaviest trailer should be uncoupled first. Explanation When uncoupling a triple trailer rig, it is important to uncouple the third trailer first. Uncouple the remaining trailers as you would normally uncouple a double. This questions appears in the following tests: Georgia Double North Dakota Double