[wushaw]

I know I just put in a reply to this but I just remembered something.

I was at Southwestwheel a few months ago getting some trailer parts and they have couplers in big tubs so I pulled a 5k and a 7k Bulldog and layed them on the counter and asked whats the difference....and the only answer was on the 7k coupler there is a 1X2X5/16 or 3/8 flat that is welded at the smallest section of the V just behind the ball retainer.

The rest of the coupler was the same thickness in material so that little piece of flat adds 2k worth of rating????