The 2008 GMC Sierra-2500HD is 18 ft. 8.7 in. (224.7 in.) long.
It's worth about $13,000. See quotes at http://www.edmunds.com/gmc/sierra2500hd/2006/index.html
The 2008 GMC Savana is 18 ft. 8.1 in. (224.1 in.) long.
The 2008 GMC Yukon is 16 ft. 10 in. (202 in.) long.
The 2008 GMC Acadia is 16 ft. 8.7 in. (200.7 in.) long.
The 2008 GMC Canyon is 16 ft. 0.4 in. (192.4 in.) long.
The 2008 GMC Sierra-3500HD is 18 ft. 8.7 in. (224.7 in.) long.
The 2008 GMC Savana-Cargo is 18 ft. 8.1 in. (224.1 in.) long.
The 2008 GMC Sierra-1500 is 17 ft. 1.6 in. (205.6 in.) long.
The 2008 GMC Yukon-XL is 18 ft. 6.4 in. (222.4 in.) long.
The 2008 GMC Yukon-Hybrid is 16 ft. 10 in. (202 in.) long.
The 2008 GMC Acadia includes 5 yr./ 100000 mi. of roadside assistance.
The 2008 GMC Acadia has a 6 yr./ 100000 mi. warranty against rust.