Average trade-in value (2006 model), July 21: $11,555
Fall-off since Q1: -$3,950
Percent change: -25.8%
The Chevrolet Silverado 3500 is a heavy-duty version of GM's best-seller, the Chevrolet Silverado pickup. The base engine is a big, 6.0-liter V-8, plus a giant, optional 8.1-liter V-8, or a 6.6-liter turbodiesel. These trucks are almost certainly purchased for business uses like home construction, which is in a slump due to the housing bubble bursting and the credit crisis. The slightly less heavy-duty Chevrolet Silverado 2500 has experienced a similar drop in trade-in values, according to Black Book.