Intermittent squeeking noise right rear on 2002 Toyota Sienna

2002 Sienna, 113k. Annoying to daily driver wife. Looked at twice by same shop; cannot find. Brakes good, tires good. Noticeable inside above rt wheel well only at 5-20 mph. Replaced rear shocks at same time noise became apparent. Possibly U joint?

Asked by for the 2002 Toyota Sienna