I know, I know…you really wanna play with the pivot at this point and the thing isn't budging. It wont for a few more steps yet! Time for the vertical tube. Decal(which is printed on reflective, BTW…thanks for the advertisement every night!) and security chain lock loop facing opposite of the hitch tube.
Unless your hitch is obviously high or obviously low, use the middle position. Again I like to alternate bolt directions.
To adjust later, simply loosen the lower bolt, pull the top bolt. Adjust to desired position, reinsert top bolt, tighten both, carry on.
The pivot probably still wont budge. :)