Ron...gotta learn how you find these links !!!
No time right now to read and digest it all, but scanning see that the design
margin is mandated (most will use it as their max, but it should
be their min), a good thing
Am still undecided and uncomfortable with the latch being the contact point for
the whole shebang...for now.
Based on my gut and that most all of the couplers I've ever seen/touched/etc all
had the latch worn more than the rest of the coupler. Of course the latch is the
only moving part... :B Even had to rebuild several because they were rusted
and banged up to the point of either stuck or none working
Finally, those specifications are for a different application where the latch
is NOT the contact point that carries the brunt of the trailer's
weight and forces 100% of the time. The coupler latch that these
specifications only get banged occasionally and during that worst
time, when Mr Murphy crosses your path, during an accident or
avoidance maneuver...
PS...this is personally the way I review any design and what teach all
of the designers under my management. CDR, critical design review, where
all invited are to comment. Toss rocks at whatever looks/feels/etc like
a weak point or issue. Resolve to whatever metrics on the table and
continue till the rocks bounce off or are acceptable 'enough' to the
specification(s)