Which trailer is most likely to turn over when making a sudden turn while pulling doubles?

When pulling doubles, the last trailer is most likely to turn over during a sudden turn due to its position at the end of the combination. The dynamics of turning with a longer setup like a double trailer means that the last trailer experiences greater lateral forces since it is further away from the pivot point created by the towing vehicle.

In a sudden turn, the last trailer swings out more, and if the turn is sharp enough, it can exceed its tipping point, leading to a rollover. This behavior is compounded by the inertia of the trailer as it tries to continue moving in a straight line while being forced to turn. Furthermore, the weight distribution between the trailers can also affect stability, but generally, it's the last trailer that sees the most drastic effects from sudden directional changes.

Considering the weight factor, while a heavier trailer may have its own challenges such as increased stopping distance, it doesn't necessarily correlate with an increased risk of rolling over compared to its position in the combination. Thus, the configuration and dynamics of the trailers are key to understanding why the last trailer is at higher risk during abrupt maneuvers.