Trailer hitch coupler issues

[MarkoPolo]

I find that it is easy to drop the hitch coupler on to the ball, but it is very hard to get the coupler closed until I actually pull the trailer forward (and sometimes back) to get it to "thunk" and then I can close the latch. Also when un-hitching, I have to use a pry bar of some sort to lift the latch up. It is ( I think) an A-frame coupler with a wrap around yoke--what is on all recent TMs I think.
Do I need to make some adjustments or is my technique wrong? I would appreciate any suggestions.
Mark