[header] How to level a trailer [title] Extend any landing gear that is built into the design of the trailer. [step] 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. 
[title] Determine the degree of imbalance present after parking the trailer. [step] This can be accomplished by placing the carpenter's level on the floor of the trailer.