When Wyatt and Juliana are at the abandoned gas station, she picks up a rock to break the lock on the pump handle. It opens on the first hit, but she continues to hit it four more times.
American-made vehicles in the occupied territories and the Neutral Zone are all pre-1945 but Wyatt Price is driving a Jeep CJ dating from around 1960. It is unlikely that Willys-Overland would have continued manufacturing the Jeep after the US lost WW2.