The front doors and the sheetmetal forward of the doors is all the same as a pickup and most of it is readily available.
Check the rear corners and the area above the rear wheel wells. Check the rear door frame and the lower surfaces of the opening. These are all places that rust badly and are hard to deal with. The lower body surface forward of the rear fenders are very similar to the lower panel on the doors, and can be replaced using a door repair panel.
There is a guy who sometimes offers panels on eBay that has made many other panels for the Suburbans and Panels but he has discontinued some of them and didn't sound like he was planning to make many of the others in the future.
Also check the roof just above the drip rail, especially behind where the headliner bows meet the sides.
Those are the areas that are problems on mine...
