Look at this showrell. Location is definitely identified as Poland 1939 destroyed bridge in Sochaczew by Bzura river which were dismantled by Germans in 1940. By the end of the movie is crossing vehicle very likely looks as SdKfz 250 which were introduced by Wermacht in 1941. Is possible that some prototypes on Demag D7 artillery tractors chasis introduced to production in 1939 were already build as this new transporter and field tested during September Campaign.
https://dobroni.pl/n/sdkfz-250-w-wrzesniu/19161 PL
https://translate.google.pl/translat...-text=&act=url Google Translator EN