Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [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.

Ending1: [title] Use the trailer on a level surface. [step] Make sure the trailer is under level level for proper alignment and landing. Ending2: [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. Ending3: [title] Keep the trailer as level as possible. [step] Take into account the size of the trailer you have rented, what types of materials you will be building, and whether you will or can lift it up. Ending4: [title] Click " over to trailer " again to fix any relevant differences. [step] If any adjustments have been made, proceed to the next step.

Answer format: ending1/ending2/ending3/ending4