Using altavista as a translater this is what it said for the picture.
By the frequent transfer of combat forces - "flying fire-brigade" - the problem of the transport of the necessary ground support equipment always became, since the existing transport aircrafts were needed urgently for the supply supply of the front. The construction DOBBAS lay the demand to reason to use normal combat aircraft for the transport of bulky loads to be able. The test site Rechlin developed and tested therefore the transportation equipment DOBBAS in the year 1942 with the airplane samples He 111, Ju 88, Ju 87 and ME 110. For the transportation equipment DOBBAS were the following devices for transport with a max. Load intended by 1061 kg: Pak 3.7 cm, Pak 5 cm, air landing cannon, mountain cannon, flakgeschuetz 2 cm or Krad with sidecar.
Micdrow