Therefore I go at the moment with the Henschel D33 and the Tankspritze Ts-2.5.
On Wikipedia you can find some more facts about the history of the Henschel D33.
Ordered by the Luftwaffe, it was used on all German airfields. For some reasons I could find out why, but according to what I read, not on the African theatre.
So here some more sources for the Henschel Tankspritze:
Henschel Type 33
here you can find a pdf with some details about the Roco model of the Tankspritze and the real one (only in German)
a video about one of the still existing Tankspritze in Germany
a second video,
And here a first picture form the Henschel Tankspritze