Well, round 2 I thought.
Nope.
I cleared out the garage to have another go at it. The frame rails look better, so I got more rust converter and was going to after the spots I missed.
Step 1, remove spare tire. The cable system for the spare finally gave up the ghost.
Step 1A, cut out the spare tire. Realize spare is flat.
Step 1B, fix flat spare. Bad valve stem. Used HF bead breaker with success, no spare stems on hand.
Step 1C, run to town.
Spare is now holding for 2 hours, should be okay.
Got a little converter slepped on the support rails of the box and the support tubes that connect the frame rails.
One of the spots that turned out decent from the last go around, right rear wheel well.
Now to figure out how to remount the spare. New cable system, allthread ready rod, use a wall anchor rod and bearing plate, or just wire it to the grill, old school style.