Have you ever wondered why the doors got heavier?

I remember helping someone with their door in the 90's right after high school. He wanted to replace his door on his 2 door 1973 Plymouth Fury.
We took one off of a 1974 Fury in a salvage yard, man that was fun loading it in to the back of my old ramcharger. Those things were not light! But again those Fury's were land barges. If I remember right we still had to change over windows and such because they were shaped differently, it's been awhile so the exact details are a blur.

His fury kind of looked like this:
View attachment 1716119860
Those were no lightweights either!