My aero rig tractor is 100" wide on the outside of the steering tires, 86" wide behind the steering tires at the firewall, and the skirts over the drive tires are 102" wide. Talk about your typical Corvette coke-bottle look! From a plan view, anyways.
I supposed I coulda made it pointy in front and put wheel pants over the steering tires, but I figured the bullet train configuration would be more appropriate. And it woulda looked like an 80,000 lb. Plymouth Prowler the other way. Which is not too bad come to think of it, as I love how the Prowler looks.
So what makes perfect sense in the configuration of 3-Wheeler's rig, would not make sense in someone else's Ecomodder rig.
One size does not fit all, in this case.