I don't know for the cars, but the pickup is indeed a Mopar product. The wheel rims are obviously a later modification, but if the rest is genuine, it's a 1950 Dodge B-2-Series: 1948-50 cab with a 1950+ Low Side bed.
Most probably a ½-ton B-2-B, as it appears to have a really short bed. Or a 1948-49 B-1-B if the bed was changed.

It's weird to see such wheel rims on an abandoned truck...