Jacks & Couplers

The jack should have a capacity of at least 10-15% of the trailer's gross trailer weight (GTW). For example, a 7,000 lbs trailer requires a jack with at least 1,000 lbs capacity. Always choose higher capacity for a safety margin.

A-frame jacks mount directly to the trailer A-frame and are more compact. Swivel jacks have a rotating base that allows the jack to fold up when not in use, providing greater ground clearance.

Coupler size is measured by the hitch ball diameter. Common sizes are 1-7/8", 2", and 2-5/16". Check your coupler label or measure the inside diameter of the coupler cup. Size must match the hitch ball exactly.

Latch couplers use a simple lever mechanism to secure the ball. Lock couplers have an integrated locking mechanism requiring a key, providing additional security against theft. Both types should be secured with a safety pin.

Lubricate the jack mechanism every 6 months or after exposure to wet or dusty conditions. Use marine grease or multi-purpose grease on gears and lift screw. Wipe excess grease to prevent dirt buildup.

Safety chains must have a break strength of at least the trailer's gross weight. Cross them under the coupler in an X pattern to cradle the tongue if the coupler fails. Leave enough slack for turns but not so much they drag on the ground.