After a quick shufti through Bart's Bible there are quite a few 4x4 cars, (the Steyr looks like a Dodge sized vehicle) or more accurately heavy cars which are also getting up to Dodge size. There are such makes as Merc (obviously), Stoewer, Auto Union/Horch and Tempo. Then of course there is the 4x4 Beetle which was built on the Kubel chassis, no doubt someone will correct me but I think Goering had one of these. I don't know if any were built specifically to be officers cars but I have seen pictures of them used by high ranking officers for parades etc. In general I think most were used as utility vehicles in the field much like the allies used Jeeps and Dodges. I'm not an expert so hopefully someone can shed a bit more light on the subject.