Lassie used Chryslers for most of its 19-season run. Early-on they used old, beat up (not new) Fords, but when Jack Wrather became executive producer, the cars got shinier.
Martin Family Car (1958) 1957 Dodge Coronet 4DR Sedan
Martin Family Truck (1959-1964) 1958 Dodge Stepside (model number unknown)
Several Dodge pick ups were used as Forest Service Vehicles, but the prop department wasn't afraid to used other makes for backlot filmed scenes: 1956 Desoto Sportsman wagon, 1957 Chevrolet Bel Air Convertible, 1959 Oldsmobile 98 4DR Hardtop, & 1960 Ford Ranch Wagon (used by several different characters)

Someday I will post them here for all to enjoy.