I'm looking at an Advance-Design era GMC 300 series, with duallies on the back. I'm not as familiar with GMC numbers as Chevy. Is this a 1-ton? Ton-and-a-half? Anyone know the wheelbase or LOA?

BTW, for old timers - I'm back. I was active several years ago; sold the truck. Went quiet. Now I'm shopping again.

George