When is the maximum distance between towed vehicles important?

The maximum distance between towed vehicles is crucial primarily to prevent accidents on roads. Maintaining an appropriate distance ensures that there's enough space for safe maneuvering and stopping, reducing the risk of collisions. If the distance is too short, it can lead to accidents, especially in situations where sudden braking is necessary. Adequate spacing between vehicles allows for better response times and minimizes the likelihood of one vehicle impacting another in traffic scenarios.

In the context of the other options, while factors like safety checks, competition specifics, or parking considerations may seem relevant, they do not align with the fundamental objective of maintaining a safe distance to prevent accidents during normal driving conditions.