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You can tell by the overspray on the eyelets of the leaf springs and the large area missed on the axle tube of the rear end that it's aftermarket paint/undercoat. Doesn't take away that it's a nice truck but would definitely wanna see it in person, like you said, to ensure that it's not trying to cover up an issue(s).
I don't have an account or I'd go in and ask what's up with all that black underneath. Completely ruins the value of the truck IMO