Man, there must be some bad juju going around. Glad you're OK and sorry to hear this.

Recall reading on the "superbumper.com" site a tow hitch mounted to the frame can actually cause frame damage because it transmits all the force right to it. Of course, this is a site selling the superbumper which they claim can absorb some of the impact and reduce chance of damage to car, so don't know how true it is,...........but makes me wonder if that's what might be found on yours.

Remember there's a new rear bumper that's been listed here and ebay in case they say they can't find one (or don't want to try too hard).

Hope it works out OK for you!