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[Dutch]

I can tell you guys that all Mopars from about 1960+ are unibodies, except Imperials stayed body-on-frame until 1967. 1966 and older Imperials are not allowed in most demolition derbies because they're practically indestructible. Chevy and Ford kept making body-on-frame cars longer than Mopar, but both had lots of unibodies by the late '60s.

And for new cars, the Ford Crown Victoria/Mercury Grand Marquis/Lincoln Town Car are all body-on-frame.

And for Mopars, the body styles for the muscle car era were as follows:

A body was the small cars, Dodge Dart, Plymouth Valiant, early Barracudas
B body was the mid-sizes, Coronet, Charger, Road Runner, etc.
C body was the full size, including all Chryslers, Dodge Polara and Monaco and Plymouth Fury
E body were the newer ('70+ I believe) Barracuda and all Cudas and Dodge Challengers

All of these cars were unibody.

Unibody cars were adopted because they're stronger, stiffer, and lighter than body-on-frame designs (generally speaking). Your friend's doors sagged because those cars had huge, heavy doors and the hinges were probably getting tired. Saggy doors used to be a common problem back when large 2-doors roamed the Earth.