What used to be a few thousand pounds now can weigh as much as 18,000 pounds for the same size load. Some drivers started out with a one-ton truck and moved up to a Class 7 or 8 vehicle before transferring to other Jones Motor divisions, Mr. Koegel said. The single-axle tractor prevents that. But the use of low-profile trailers lets the fleet carry loads that otherwise would be over height. Drivers also like the lower gross weights since they get a better ride, he said.
Some drivers have a real comfort zone for lighter loads, too.
The Class 7-8 tractors are from a variety of original equipment manufacturers. Most have full-size sleepers and considerable amenities. The relatively high horsepower ratings help the trucks as they run over the mountains to the West Coast and back, Mr. Koegel said. Some early hot shots were notable slugs on the grades, he said. The power also comes in handy for overcoming the poor aerodynamics of some loads.