I had the cab, doors and fenders of my 1935 truck stripped in a shop near Raleigh, NC. The process started with heating the parts to 800 F which burned off all the paint, body filler and lead with no metal distortion. Then once cooled, a pressure wash followed by submergence in a weak phosphoric acid water solution at 120 F to remove rust. Then another pressure wash and coating of orthophos preservative was sprayed on.
I was very happy with the results - all clean metal, no rust anywhere. The only issue was the acid removed some of the threads in the D-nuts so those had to be replaced.
This might not be the process you are looking for, but it worked for me. The total cost was $1,200 in 2017.