I have a feeling you're not in the financial ball park. I did a quick internet search for Chevy Silverado, landed on a couple web sites. Found this on one of them. This is an average cost of the Silverado. When looking at their site, it has trucks from all over the country. I think these figures are pretty average too. I don't know if these prices are diesel, dually's, or engine size without exploring each one:
http://www.carsforsale.com/used_cars_for_sale/2010_chevrolet_silverado
Chevy Silverado:
2012 - $33,220
2011 - $26,900
2010 - $25,096
2009 - $21,684
2008 - $17,955
2007 - $18,005
2006 - $14,043
2005 - $12,060
2004 - $14,453
2003 - $10,901
2002 - $17,000
2001 - $9,399
2000 - $6,996
1998 - $7,297
1997 - $5,350