That really sucks.....hope it works out for you......make sure they use the NADA book for the value on your 'burb.....it lists value at $3275-16,800 for the high lows on a 2wd 1/2ton 'burb.......so you would have to evaluate the condition but that is the book they should use.....here is their link
http://www.nadaguides.com
good luck with everything.......