Jason Braswell of Morgan & Morgan in Athens, Georgia passed along is case of  In re Carter , Case No. 3:07-CV-50, Ch. 13 Case No. 06-30846 (M.D. Ga.) (click here for .pdf), wherein Judge Land affirmed the Bankruptcy Court’s ruling that surrender of "910 vehicles" constitutes full satisfaction of the claim. 

This issue has been discussed in more detail here and hereJudge Massey and Judges Bonapfel and Diehl of the Northern District have held that surrender does not constitute full satisfaction.

Update 2/19/08 – The Eighth Circuit Court of Appeals has held that the creditor retains the right to assert a deficiency claim.