Bulldog adjustable couplers allow level towing behind a variety of towing vehicles because the height of the trailer tongue may be quickly adjusted to match the height of the hitch ball for safer, smoother towing. Coupler fits inside a 2-7/8" wide channel that we sell as part# 21-304 (4 hole) or 21-430-1 (6 hole). This 2" coupler is rated at 7000lbs.