I showed my Stug IV to YesthatPhil, who commented that it looked rather lower than the III. That was my impression too. Wickipedia gives actual heights as 2.2m for the IV and 2.16 for the III.
Lining them up showed that the IV was the same height as the III, but the visual impression comes from the extra length of the IV hull. Surprisingly, the IV weighed in at 900kg less that the III. I threw in a Pz IV for good measure. Although lower than a tank, both designs failed the specification that they should be no taller than a standing infantryman.
Do I hear “scale creep!” being muttered on the back row?