The 2007 GMC Sierra-2500HD has a 11 ft. 1 in. (133 in.) wheel base.
The 2007 GMC Yukon has a 9 ft. 8 in. (116 in.) wheel base.
The 2007 GMC Savana has a 11 ft. 3 in. (135 in.) wheel base.
The 2007 GMC Canyon has a 9 ft. 3.3 in. (111.3 in.) wheel base.
The 2007 GMC Acadia has a 9 ft. 10.9 in. (118.9 in.) wheel base.
The 2007 GMC Yukon-XL has a 10 ft. 10 in. (130 in.) wheel base.
The 2007 GMC Savana-Cargo has a 11 ft. 3 in. (135 in.) wheel base.
The 2007 GMC Sierra-1500 has a 9 ft. 11 in. (119 in.) wheel base.
The 2007 GMC Sierra-3500HD has a 11 ft. 1 in. (133 in.) wheel base.
It's worth about $13,000. See quotes at http://www.edmunds.com/gmc/sierra2500hd/2006/index.html
The 2007 GMC Canyon has rear wheel drive.
The 2007 GMC Acadia has front wheel drive.
The 2007 GMC Savana has rear wheel drive.