Posted by Brian A. on Sunday, December 05, 2004 at 7:00PM :
In Reply to: What model was it? posted by Tyler on Sunday, December 05, 2004 at 2:15AM :
Depending on what testing program you are thinking of. I know that they had the Rolligons for arctic testing, there were also Terra-Tires put on WDX-style, M-37s, Sweptlines and Pilot House series trucks that I am aware of.