Stan I would say that you remember right. I would explain it this way. Back in the day of forty foot trailers, most LTL freight companies had mostly forty footers. They used newer ones on line haul, (long distance) and older ones for delivery and pick-up. The line haul loads tended to be heavier so there was often a tandem tractor pulling a trailer with the tandems set all the way to the rear in order to meet scale rules with the weight they carried. Delivery loads tended to be lighter and tractors usually single axle. For tighter turning radius the trailer wheels would usually be slid forward. These days the 53 foot trailers are used a lot less for delivery than the forties were and many more LTL fleets are running more double 28s for line haul and for delivery as well.
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