Update.
The recycler's asked for three quotes, I gave them four selected from the seven I got. Recycler's will compensate me.
One shop wouldn't even touch it. A couple shops balked at the idea that this was Tremclad and a roller. Three shops said this would be written off if it went through insurance.
I chose to repair it myself, for a few reasons:
1) I don't want the truck stripped by some hoodlums climbing into the compound overnight.
2) I didn't want the truck stolen by some more adventurous hoodlums.
3) I don't want the work to go over budget and be on the hook for that.
4) I can pay a pro to screw it up, or I can screw it up myself for free.
5) Personal skill acquisition.
6) Something else I've since forgotten because I'm old.
So, I took the paint off the offended areas and used a variety of failed attempts to pull it all back out.
I tried MIG welding some pull tabs and using my hoist, then a lever thingie I made, and then a slide hammer I made, but in the end found MIGing was a poor choice - I couldn't get things close enough, and the MIG beads are NOT very malleable, so ultimately I screwed myself in the edge placement.
Then I tried a stud gun to try and pull the rest of the damage up, and use my shrinking disc to put the high spots down, but just plain could not get happy. I could bring up the crown, but it would oil can. So I'd shrink it to get rid of the oil can, but I'l lose the crown. Rinse and repeat. My butt was being kicked. I needed to be super super super delicate with the disc, but in seconds I'd lose the whole thing.
I spent probably 10 hours trying to pull it all out, and eventually called the help of a friend who does autobody. I don't like crying for help, and I particularily don't like drawing on someone who does this for a living. However, buddy came over, and was most kind about my attrocious butchery of the metal. We spent about 3 hours and got things a lot better, and I learned a LOT about dent removal, more so than I would have had I not reached my wit's end trying it on my own.
Youtube and books can only go so far, it seems. I needed a human for this. I am largely self-taught in a lot of areas, and I usually pick up a skill fairly quickly, but not autobody. And it frustrated me immensely being unable to pick this up quickly like I usually do.
Quick tips I learned from this:
1) "The first one in is the last one out" - work the dent in reverse of the way it happened.
2) Use a heat gun to heat the metal upward, then use air to cool it off.
3) Use the Shinking Disc to take off the high spots only.
4) You're trying to ballance all the tension and looseness in the highs and lows so the whole panel works out even.
5) Any/all defects in the panel contribute to any/all the problems in the panel.
6) Torch shrinking can be risky, because it is a whole lot of action all at once.
7) Propane torch shrinking heats up slower, but in doing so affects a wider area of the metal.
8) Don't MIG anything (this created more problems than I want to admit)
9) You need to modify your angle grinder to make the shrinking disc lay flat on the panel.
In the end, the roof is now very much "close enough." I'll work a few more low and high spots, and then a skim of filler. It is still not completely free of oil canning, but I'm not interested in chasing this to oblivion. I will likely use some "Flutter Foam" in-between the roof skins to give the skin some rigidity.
Still: not loving the autobody skills here.
But the recycler's cheque paid for the air ride on the '61. Priorities.