I can only think of one major area on an AD that you would need to 'blind dent' repair and thats the rear crown of the roof at the double skin,or round the perimeter of the rest of the roof.
Mine's suffered the dreaded ladder dents there so a stud puller would seem the way to go,but I just can't justify the cost of a dedicated machine.
I'm pretty sure Eastwood make a MIG welder shroud attachment that allows you to tack copper studs on with a standard MIG unit.
Much cheaper and just as effective.

Sorry it wasn't Eastwood but a company here in the UK.
Here's a link anyway...

Stud welding kit.

Last edited by jockbolter50; 06/21/2014 7:45 AM.
1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.