We were fortunate enough to have Chris from Kilby, the designer and manufacturer of the Max Coupler, stop by this morning and drop off the very first run his newest couplers. They have been significantly redesigned to meet an SAE J684 rating of 10,000 pounds. Testing results are still being compiled, hence the 6,000 pound rating on the first few production pieces, but for most of us on this forum 6K is plenty
The redesigned coupler uses less parts to decrease the stack height of the pivot and create a smaller lever arm, and more material in the higher stress areas, what this means to the end user is that it's easier to install and stronger at the same time.
We have a few in stock for $225 (fortunately for you guys the retail price has not changed with the redesign) plus shipping.