There was a program to move suitable comercial wheeled transport into Wehrmacht and Luftwaffe use. Perhaps the management and enginering attention went to that critical effort diverting effort from AFV salvage?

Beyond that there does not seem to be a truly efficent effort at exploiting the industry of the occupied territorys. A university professor I studied under had researched the Cezchoslovakian economy in the 1930s. in the 1950s he looked at data for the subsequent decades and thought that industrial outpout of Cezch industry actually declined during the era of nazi control. I've heard similar opinions expressed for industrial production in other occupied areas.

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