I would lean toward alignment with the slim possibility of a loose/worn wheel bearing on that wheel. Generally balance will show itself in bounce or wobble with spotty wear.
There are others here who know more about this than I who should chime in soon, but those would be my thoughts.
Best of luck.
1994 30' Monaco Dynasty, 5.9 230 HP Cummins, MD 3060, 1992 Geo Tracker.
1996 Dodge Cummins 2500 with 1996 Lance 945 camper