Tractors, therefore, cost and weigh less than our common 6x4s that pull a tandem-axle trailer. The 4x2 works ... can’t grab enough traction while off road. So such operators often use 4x4 ...

Instead of a typical trailer suspension with an axle that could hang up ... as well as a place to sleep up off the ground can turn a Jeep trip into a luxurious vacation. See All 31 Photos The ...

That’s the plan for a hybrid electric-drive trailer tandem being ... a drive axle to help the truck run uphill. Operation is completely autonomous and, except for an on-off switch, the driver ...