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The reason for never unlocking the pintle hook with the dolly under the rear trailer centers on the potential for the dolly towbar to lift unexpectedly. When the pintle hook is unlocked, there is a risk that the dolly, which is designed to stabilize the connection between the truck and the trailer, could suddenly move or shift. This unexpected lifting can create dangerous situations, potentially leading to loss of control or an accident. The lifting of the dolly towbar poses a significant safety hazard to the driver and others in the vicinity.

In the context of the other options, while misalignment, weakened connections, and air leaks are valid concerns in other scenarios, they do not directly address the immediate safety risk associated with unlocking the pintle hook under these specific circumstances. Therefore, focusing on the unexpected lifting of the dolly towbar emphasizes the importance of maintaining control and safety in towing operations.