47-55.1 AD Series Nasty Spots

[Father&son56project]

I am starting to consider my next build ( once I finish Project Fargolet), and up here in Ontario you have to start the hunt early as most of the stuff is rotten beyond words. I’ll be looking at unrestored trucks with a patina’d finish that I will leave alone. I’ve done 4 builds now, and I’m fairly decent at spotting rust problems, BUT every vehicle has its own unique problem spots and some of those spots can be truly miserable or expensive to repair. I like the AD series, and I will be checking out a ‘52 GMC shortbox in the future (it’s currently buried under snow), so I have a question for the forum members:

If you had to pick one or 2 spots where these trucks are prone to rust problems, and repairing these spots is truly awful, what would those spots be, and how would you examine the truck for those problems?

I can spot the usual suspects for rust, but a little input from members may keep me from discovering a true horror down the line!