Mostly single-axle tractors,pulling some 36' tandem trailers,but back then,that would top-out at 40,000#.(Gross Combination,Tractor/Trailer). That's what I know about the old White B222T's,and the KB 10's. Those trucks were running some big 6's,though,like the 426 G.M.C. Not sure of Tractor/trailer combo.,on the (A.D,T.F.,and "Blue-Chip) trucks in this video,but they're getting a work-out! Pulling just as much as the bigger rigs! ENJOY!!
