[DS] TDs

Two points from the discussion: 

1) Correct me if I'm wrong, but didn't the 
Dodge 3/4 ton (Powerwagon?) mount a 
57mm, not 37mm?

2) Stug-IV - wasn't this equipped with a 75 for 
its main weapon? That's not what I'd call exactly 
a low velocity weapon. Or am I confused?