RE: Insurance settlement
The one thing I would look out for is making sure that whatever shop you
take it to is will to work with the insurance company that will be paying
the bill.  Ask them outright are they willing to take a job that will be
paid for by State Farm.  Not all shops that the insurance company will work
with are on their list.
Second, and just my personal position, I'd tell the adjuster in no uncertain
terms that the damage to the rear was caused by the accident and they either
accept that and fix it or go to the authorities and file a complaint against
you for attempted insurance fraud.
BTW, I just went through the same process with Safeco over a guy that hit me
(my T-Bird, not my Vanagon) during the ice in December.  Less damage, around
$1,000 and I went with a local shop on the Safeco list.  They did as good a
job as I expected with no problems.