A hybrid electric-drive trailer tandem is being developed by group of engineers who promise substantial fuel savings and fast payback. The device, which for now has no official name, is under road ...

Hybrid trucks? Sure, though they’re somewhat complex and expensive, and interest has waned in the face of cheap fuel. Hybrid trailers? Comin’ up, and they’ll be comparatively simple and quicker to pay ...

You can’t drive a trailer, but the Hyliion hybrid electric tandem can help propel your rig down the road. From the driver’s seat, you feel nudging from the powered trailer behind. Its primary purpose ...