Replacing the adjuster on the hitch would have probably fixed your jamming but a McHitch is way, way better and looks cool......................I've put flyscreen on the inside of the fridge vents, top and bottom for the bug reason and check the screws are tight down there at times...................wish I could work out why mine doesn't work on 12v but thats for another thread.
Looks great @achjimmy but did you get any dust in or what precautions did you take to prevent dust entry.