while it doesn't look like a tap of a hammer would collapse the frame, that 1st picture on the rear axle is pretty concerning to me.
then again, i'm not from a rust state so I don't know what is considered past the 'acceptable' rust threshold as a buyer.
i would post in the 4th gen section with the question and call out rust belt members in the thread title. the reason I advise this is different gen's sometimes are prone to rust at different areas of the underside.