To avoid drilling holes, I have used a home-brewed setup similar to this kit to pull dents in places I can't reach with a hammer and dolly. I super-glue L-shaped tabs onto the metal and use a small slide hammer or vise grips and a pry bar to lift the dent. A little bit of heat from a propane torch removes the tab once the metal is lifted.
www.ebay.com/itm/315206103060?Here's another way to do the same thing:
www.ebay.com/itm/275702852395?Jerry
