I believe Volvo does offer a light package, but with the steel cab they will never be the lightest. Tidewater Transport runs tankers and they probably know how to get them as light as anybody.
When GM/Volvo teamed up the truck hauling fleet I was in for ten years required Volvo's. When they began allowing anything, most guys stayed with Volvo.
A friend from Monroe Mi, avid drag racer/ gear head, stayed behind at the bottom of a hill while running mt with five or six fellow drivers."i'll catch up" he told the guys.
His real intention was to wow them with his triple digit truck.
Not real mature.
Racing up the hill, he decided to pass on the right heading into a curve.
He rear-ended a Yellow set of doubles that was chugging along in the right lane.
The engine dropped down under the cab, the air bag deployed, the crumble zones crumbled properly. He walked away from a big wreck.
The company waived discipline in exchange for making a Seat Belts saved my life poster. The secret is he wasn't even wearing his seatbelt.
He feit as silly as fellow driver Greg Wilson, who armour-all'd the seat of his drag bike, and watched it go down the dragstrip without him.
A fellow Fedex driver got a ticket this week. Lift axle up. 200 lb load, 2100 over on drive. Opps ! DR unit.
Can any DR unit even run legal with their lift axle up ?