You have no pics of the frame in there: just the floor pan there, with some kind of cutaway part of the surface and the other pic is the drivetrain, mostly. Doesn't look too bad, actually, in that pic. But that floor pan needs a closer look. What do you see when you look under the carpet? By the pedals...? Might wanna check that out.
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Try to get more pictures of the frame itself, especially where the rear lower control arm attaches to the frame in front of the rear wheel, and where the skid plate is bolted to the frame. These are 2 of the most common rust problem areas.
Also check out the brake lines because they can rust enough to fail.
I do not consider rust normal. I would look for a vehicle with less of that normal rust on it. You can fix a lot of things but rust is not one of them, it is a loosing battle once there is perforating rust.
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