Fulton Fas Lok Straight Class II Trailer Coupler 2" Ball 3" Channel 3500 Lbs. 3500lbs. 22300 0101. This straight Class II trailer coupler is easy to install and the factory adjusted ratchet clip and pin keeps the coupler open while connected. The Fulton Fas 'Lok Straight Class II Trailer Coupler has a weight capacity of 3500 lbs. While it may be easy to install it is not as easy to take off. This coupler is a great choice for those just starting out and want a reliable easy to use coupler. Features of Fulton Fas Lok Straight Class II Trailer Coupler 2" Ball 3" Channel 3500 Lbs. Class II coupler Fits 2" hitch balls Channel Size: 3" Weight Capacity: 3500 lbs. Zinc-plated for corrosion-resistance Package Contents: Fulton Fas Lok Straight Class II Trailer Coupler 2" Ball 3" Channel 3500 Lbs. Fulton 22300 0101: Fas Lok Straight Class II Trailer Coupler 2" Ball 3" Channel 3500 Lbs. 3500lbs.