Bryan wrote:
snip..
Having a lot of trouble with latching and releasing the trailer hitch. I'll
throw a little grease (it's been a year) on the ball and see if that changes
anything, but I think the real source is the V shape the hitch and tongue
make when I park my boat on my slanted driveway with my truck in the
opposite slanting street.
snip..

I was having trouble with my brand new trailer coupler.
Turns out there is a little plate up under the tightening screw that
should have its widest part facing port & starboard...with the narrower
part facing fore & aft.
Sometimes you do have to jiggle it a bit to get it to release.