When driving a set of doubles or triples, where should the heaviest trailer be positioned?

Trailer weight order in doubles/triples: Place the HEAVIEST trailer FIRST (closest to the tractor), with trailers arranged in DECREASING weight toward the rear.

Why: A heavy trailer at the rear amplifies the 'crack-the-whip' effect and increases instability and rollover risk; a lighter trailer at the rear swings less violently and is more stable; keeping more weight forward improves handling and traction.

Stability: The combination is most stable with weight distributed heaviest-to-lightest front-to-rear; LOADING within each trailer also matters — distribute weight properly, keep the center of gravity low, secure the cargo.

Rearward amplification: Since the rear trailer experiences the most amplification, having it be the lightest reduces the danger.

Regulations/practice: This loading principle is part of safe doubles/triples operation; drivers and loaders should arrange trailers by weight; an improperly ordered set (heavy trailer at the rear) is more likely to roll over or lose control in a maneuver; this weight-ordering principle is tested on the doubles/triples endorsement and is an important safety practice for multi-trailer combinations.