My dad had a couple of pickups like that, the one I remember most was the one that the doors did not stay closed and it was a shift on the floor. We had to bunge cord the doors and not sit near the edge of the seat going around a corner.
We also owned a truck like that, we took it uptown one day, and as I was stepping to get out from the passenger side my left foot went thru the floor and my right foot was trying to reach the ground outside the door. It was hard to get my leg out without getting cut on the metal and we were laughing so hard we couldn't quite use our brains to figure it out. The kids had to get dad so he could help get mom out of the floor of the pickup.