I found this nice image of a 30,5cm Skoda M16t howitzer in german use near Warsaw during the Polish Campaign, 1939.
Germany got some of these howitzers from Czechoslovakia (17 pieces) 30.5cm H638(t) in 1939 and Yugoslavia (5 pieces) 30.5cm H638(j) in 1941. Probably also obtained in 1938 a piece held by Austria during the interwar period. Total = 23 howitzers
They saw service against Poland, France and the Soviet Union in World War II where they served with Heavy Artillery Battalions (schwere Artillerie-Abteilungen) 624, 641 and 815 as well as two Heavy Static Artillery Batteries (schwere Artillerie-Batterie (bodenstandig) 230 and 779.
I'm looking for pictures of this howitzer in travel position, especially of base and carriage trailers.
What is the correct name of these howitzers in the German Army? 30,5cm Mörser (t)

It seems that Romania did not use their howitzers against the Soviet Union. Does anyone know why?

I guess they would have been very useful in Odessa siege.
Regards Sturm78