Yours has the front ladders plus a better paint job. Nice job on the weathering too. No luck looking for overhead shots of similar haul trucks to see where the paint gets scraped off by the loads.
from what I remember in the quarry--the entire bottom and front of bed were bare. The sides would vary----because of the mounding of the rock. The lip over the cab would be bare at the rear, transitioning in to good paint at the front
we were digging limerock, so lighter material would mount higher on sides and cab lip