[sokoloff]

Here's a video of the wheels in motion: https://vimeo.com/34501723

Disregard the text on the video description as it's blatantly wrong (describing that the trim tabs still move without the wheels moving; wrong on two accounts: the trim doesn't move without the wheels moving and the 737 uses a jackscrew for horizontal stabilizer trim rather than trim tabs [which is why the pilot can't simply override the aerodynamic force as they could with a trim tab])

Jackscrew operation: https://www.youtube.com/watch?v=rxPa9A-k2xY

The 7-3 has balance tabs to make the control forces lighter in the event of a hydraulics failure, but these are not trim tabs in any sense of the word.