Waymo could develop some type of modular docker-type container that would significantly fill the interior of their vehicles, or maybe even replace the interior of their vehicles. So equipped, a Waymo vehicle could be used to deliver supplies and stock to small businesses throughout the city throughout the week. Think small chains such as convenience stores, they could lower the per-store inventory and refill from remote, cheaper-rent areas, if they had three Waymo deliveries during the work day.

Those vehicles would then be fitted with the human interiors for the high demand periods you state.