There are several different models of the GMC Sierra. The base price for the cheapest model, the GMC Sierra 1500 Regular Cab is 21845 according to the Kelly Blue Book.
The 2003 GMC Sierra-2500HD has a 6.0 L base engine size.
The 2006 GMC Sierra-1500 has a 9 ft. 11 in. (119 in.) wheel base.
The 2009 GMC Sierra-3500HD has a 11 ft. 1 in. (133 in.) wheel base.
The 2012 GMC Sierra-1500 has a 4.3 L base engine size.
The 2014 GMC Sierra-1500 has a 4.3 L base engine size.
The 2008 GMC Sierra-3500HD has a 6.0 L base engine size.
The 2014 GMC Sierra-3500HD has a 11 ft. 1.7 in. (133.7 in.) wheel base.
The 2014 GMC Sierra-3500HD has a 6.0 L base engine size.
The 2002 GMC Sierra-1500 has a 11 ft. 1 in. (133 in.) wheel base.
The 2005 GMC Sierra-2500HD has a 6.0 L base engine size.
The 2012 GMC Sierra-2500HD has a 11 ft. 1.7 in. (133.7 in.) wheel base.
The 2003 GMC Sierra-2500HD has a 11 ft. 1 in. (133 in.) wheel base.