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How to level a trailer
Extend any landing gear that is built into the design of the trailer.
In most cases, the landing gear is operated with a simple hand crank. Making sure the gear is touching the ground before attempting to make any adjustments will add some stability to the trailer and provide a better idea if any adjustments are needed at all.
Determine the degree of imbalance present after parking the trailer. This can be accomplished by placing the carpenter's level on the floor of the trailer.