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Stopping the tug test when you feel resistance from the trailer is the appropriate choice because it indicates that the coupling is secure. The resistance felt in this scenario suggests that the fifth wheel has properly engaged with the kingpin of the trailer. This is essential for ensuring that the trailer is firmly attached to the tractor and decreases the risk of accidental detachment during transportation.

Feeling the trailer move might occur due to a loose connection, which could lead to unsafe conditions. Continuing the tug test beyond the point of resistance could be unnecessary and may not provide additional value in confirming the connection. Limiting the tug test to when resistance is felt allows for an efficient and effective way to assess the hitch integrity.

While aligning the trailer is important for the initial hookup, the tug test focuses on the engagement of the coupling components rather than the alignment of the trailer. Additionally, setting a specific duration for the test may not accurately assess the mechanical connection necessary for safe transport. Thus, stopping when resistance is felt provides the best assurance of a secure coupling.