Final answer:
You should drain your vehicle's trailer air tanks daily or at least once a week to remove accumulated moisture.
Step-by-step explanation:
The frequency at which you should drain your vehicle's trailer air tanks depends on the specific recommendation provided by the manufacturer. However, as a general guideline, it is recommended to drain them on a regular basis to remove any accumulated moisture and prevent potential issues.
It is ideal to drain your vehicle's trailer air tanks daily or at least once a week, especially if you operate in humid conditions or notice a buildup of moisture.