I was able to get the catch to work.
I had to remove the strike, and re-install it as far as it would go to the rear of the truck.
Then I made three thick gaskets to go under it.
Then I had to slightly bend the rear sill slightly upward using a 2X4 and a floor jack. I was rear ended years ago (my neck still hurts) and it bent the sill.
Finally, I had to file the strike to make a sharp edge. It had gotten rounded off enough over the years that the carch on the door would jest slide off.
Now it works. Joy.
Kurt