This is a commonly asked question. The base of the tongue jack has three UN-EQUALLY spaced holes, you cannot turn it using the mounting holes. Some, a few electric jacks have an extra set of holes that attach the head and if you disassemble it you may find that you can reassemble the head on the column sideways......... but most are not like that.
Second pic is of my tailgate clearing the tongue jack, which it would not with the Equal-i-zer hitch.
The shank on the hitch is a separate part from the hitch head itself. The critical distance is from the center of the pin hole to the center of the vertical row of holes mounting the hitch head. Some are 8 inch, some are nine inch, you can also buy them that are 12 inch. The vertical part the head mounts on an industry "standard" 2 inch square bar with 3/4 holes spaced 1¼ inch center to center. You generally interchange shanks from one brand to another.
I had an Equal-i-zer hitch that I used with a Thor trailer. I had read about how good they were, bought a nice one used, and discovered the hitch was a real PITA to adjust and I basically hated it. I gave it away with the trailer when I sold it. I bought and installed the Blue Ox (on a Bigfoot which is a peculiar installation as you have to cut a fiberglass fairing to fit anything), and found that while the tailgate would not clear with the Equal-i-zer it did clear with the Blue Ox as the BO shank is one inch longer than the Equal-i-zer shank.
Looking at the Fastway web site the
Replacement Parts page list shanks for the round bar head and the trunnion bar head, yet the shanks are for all intents and purposes, the same shanks. The difference in the drop and rise dimensions is due to the difference in the way the hitch heads are made (relationship of the mount holes to the height of the ball.) Rather than have one listing with two columns showing the drop and rise of the BALL for a particular hitch head, they make it look as if the shanks are different which they are NOT.
I'm going to seriously suggest a Blue Ox Sway Pro hitch, it really is a better hitch.
Charles