This should solve the problem:
1) Hitch the trailer to your tow vehicle.
2) Raise the jack so it's off the ground (doesn't need to be cranked all the way up), then rotate it as if you were putting it in the travel position but stop at about 45 degrees.
3) Make a mental note of how much of the inner metal tube (with the wheel) is exposed outside of the outer tube.
4) Now crank the jack so that the wheel comes out as far as possible (still in the 45 degree position).
5) Using a heavy duty wheel bearing grease, rub a thin coat over the inner metal tube from the point that was previously hidden, but became exposed when you cranked it out (see the mental note in step #3).
6) Crank the inner metal tube back in to about where it previously was.
7) Spin the wheel around a couple of times to evenly distribute the grease inside the outer tube.
8) Wipe off any excess grease; lower the jack; & unhitch the trailer.
It should now pivot more freely.
