The gun carriage of the schwere 15 cm Kanone 18 - heavy 15 cm cannon 18 - was moved with the Protze für 15 cm Kanone 18 - limber for 15 cm cannon 18. (Image from Bildermappe eingeführte Waffen und Geräte)
During the production run, different wheels were used for the gun carriage and also the limber. Possibly these wheels originated from the 21 cm Mörser 18.
