That... What?!
At the local MFA, when buying feed or fertilizer, you back your vehicle up to the warehouse-style loading dock, where the raised floor of the storage facility is about the height of the average truck bed off the road height. When I buy things in my sedan and load them into the trunk, I either have to drop them off from a great height, or take them down a small set of stairs. When people buy in a truck, the employees use a forklift to put the pallet directly into the truck bed.
At the farm, it's not uncommon to have a tractor with a front end loader either with a bucket to dump things into the pickup bed, or a set of pallet forks for loading/unloading solid or bagged objects.
How can you _possibly_ say that there's "literally no utilitarian use" for truck beds in agricultural settings?