I think you're over-thinking this. How much driving on snow-covered, salted roads are you going to do? Your truck lives in a garage and is well taken care of.

Ol' Roy had no undercoating since new and was used as a regular truck into the 1990s. It has virtually no rust on it.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)