The passenger rear door lower hinge broke when I opened it, so I left the other door closed.
That is the most disturbing detail I saw. A piece of steel nearly 1/2-inch thick rusted through is not a good sign.
I bought a very rusty Suburban some years ago and have found either patch panels or rust free old replacements for nearly every rusted panel.
However, I've spent years and more than a few dollars and still have not finished the repairs.