Question When placing more than one semi-trailer behind a tractor: Answers The lightest semi-trailer should be at the very end. The heaviest semi-trailer should be in back. The order of the semi-trailers does not matter. The semi-trailer carrying the most boxes should be in the rear. Explanation For safest handling, the lightest trailer in a multiple-trailer combination should be positioned in the rear. Take a FREE Practice Test Now This questions appears in the following tests: Nevada Double ,