capacity
How much of the capacity was used, as a time-weighted fraction.
This is the row FracTimeTransporting is mistaken for. That one reads 1.0 whether a vehicle carries one load or four: it is a fraction of time, not of capacity, and reading it as utilization on a multi-load fleet reports a vehicle moving one pallet at a time in a four-pallet body as fully utilised. This is the one that answers the question people mean.