[MDPotter]

I installed the Honda seals on mine and it still takes force to close them, but not nearly as much as you've described. Doesn't yours have the air pressure relief valve in the driver jamb? I thought those were a 71-72 improvement. I had my doors adjusted really nice during bodywork which leads me to believe there just isn't much room for a weatherstrip between the door and cab. My 2016 has a seal on the door and on the cab, so it's a rubber-on-rubber seal, not rubber on steel and I think most modern vehicles are this way.

My doors are easier to close with a window down a little, but that's not a good solution for security and weather.

I'd like to see how these trucks were from the factory - how flush the door was to the cab and fender, how hard the door was to close, how well the weatherstrip sealed the door, etc.