I'd get better pictures. They clearly used black spray paint to hide the actual condition. Not always a bad thing if it is disclosed up front and they prepped the surface in an effort to slow the rust. The gas tank cover and front skids rust pretty bad in the rust belt states but aren't critical components.
See if they can take pix of the moving parts around the wheels, things like suspension components, sway bar links, etc. Those are areas I constantly struggle with on my rusty rig.
I'd also ask for pictures of any body rust around front wind shield, on tailgate, especially near the handle, rocker panels in front and behind rear wheels.