Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to hook up a trailer [title] Raise your trailer tongue ball socket or coupler to a height to clear the ball. [title] Line up the center of your vehicle with the center of your trailer. [substeps] Use a jack attached to the tongue.

Ending1: If using a cow hitch or bike trailer, use a boat jack. [title] Connect your hitch to the pulley. Ending2: [title] Pull the tongue ball at the right length and angle of your trailer. [title] Stop moving so that the tongue ball extends completely. Ending3: Be sure to jack up enough so you have enough clearance so you do not hit the trailer. [title] Stop the vehicle once the tongue coupler is over the ball. Ending4: Your second drill bit will be used to relieve a reasonable gap between the tongue and your driver side bodywork. [title] Squeeze the drills using a normal (but not hurting) motion until the drill is complete.

Answer format: ending1/ending2/ending3/ending4