My bad on the MVP. Knew it was altered via SH3 commander though, somehow.
IIRC, C2 and C3 were US Maritime Commission ship types built for the US Navy and they had the tonnage given by original SH3. There were just under 200 C2's built.
The nerfing of the tonnage is not correct per se, T2 T3 C2 & C3 were ship classes, but as an intermidiate fix untill we get ~3000-5000 ton merchants (3d) models its quite ok.