Strange that they would be
Strange that they would be willing to give up space volume, since package hauling is all about space rather than weight. The fuel savings must be significant enough that they're willing to add on the extra trucks to make up for the lost volume.
The new trucks have a more streamlined look to them, but not sure why they would be "long haul" since that implies a lot of distance. A delivery van (these are usually called "walk-in vans") is not a long haul vehicle, it's meant to go door-to-door. By "long haul" they probably mean routes that are 100+ miles daily, such as those out here where I live.