Thanks, Frank. Not criticising your design. It's better than my welded in splines and sliding sleeve idea. Are you dimple-drilling the bar for the set screws? Might make for a better bite on the bar. I like the "no welding" approach.

I like some spring loading for dis&re-engagement purposes. it lets you pull the pin or set the pin while rocking the truck (hand rocking or driving swervies) so there's no binding. I imagine the air ram will do the same, but I don't have a compressor on board and don't plan on one. I suspect you could sucessfully use the air ram with only canned air that you recharge periodically, too....

Nice piece of work, guys.