The Anhänger (1 achs.) für leichte Lasten - one axled trailer for light loads - (Sd. Ah. 3) was used for motorised towing of the normally horse drawn 7,5cm Feldkanone 16 neue Art and 10,5cm leichte Feldhaubitze 16. (Image from D 600)
This photo illustrates the Sd. Ah. 3 loaded with a 10,5cm le. FH. 16. This trailer was mainly towed by Sd. Kfz. 6 and Sd. Kfz. 7.