I think the ideal post-war German transport (as a starting point) would be the Arado 232A/B series:
LINK
Ten were built and used during the war to shuttle parts from plant to plant inside Germany in an operational transport role.
----------
Any discussion on post-war Nazi Germany's military has got to incorporate the fact that more so than other nations, there were independent satrapies within the state hierarchy operating as they mostly saw fit; e.g. the SS state within a state.
While every nation has a bit of this with favored contractors (Boeing for heavy jet bombers for the USAF), the Germans went a bit overboard with it.
With tanks alone, you've got:
Henschel
Krupp
Porsche
Daimler Benz
MAN
And parts might be mixed and matched from various manufacturers to get what they wanted -- e.g. Krupp turret and Henschel hull (Tiger I), while manufacturers might order production expecting the order (Porsche Tiger), only to be left having to find a use for them (remanufactured into Ferdinand/Elefants).
Peacetime development would alleviate a lot of this craziness by reducing the pressure on design teams; but it'd still be there.