New Car (3k miles) that had repairs for rear end damage

IF it were me - I'd pass!

To respond to your questions at the end -- $5,000 being enough is up to you to determine based on your comfort level. "Smashed Rear End" and "hail damage" are two completely different things. I would be concerned about structural damage on a "smashed" vehicle, beyond cosmetic sheet metal. Also, be advised that this car that has been "never owned" with a warranty in service date means that it has indeed been titled to someone -- even if it was a "loaner" or "rental" vehicle at the dealership. You've already lost a year of factory warranty, AND, it cannot be sold to you as a "NEW" car. My recommendation, if you are totally into this car, would be to ask for more information, more transparency, get all the facts, and decide if it's the right deal for you.