> What's missing in this analysis?

Tree maintenance labor, harvest labor, storage before shipping, labor to load the truck, labor to unload the truck, supermarket storage, supermarket shelf-stocking labor, supermarket disposal labor and cost for any stock that spoils.

That's for peaches intended to eat whole. The peaches we're talking about here are intended for canning, so you also have to add the cost of running the processing and canning machinery, the cost of the cans themselves, and the cost of labor to run and coordinate all that.

Also consider that no single supermarket is going to buy out the entire truck, so you're going to be stopping at many supermarkets, and unloading multiple times.

For larger chain supermarkets they may be buying a full truck (or multiple), but then you'll probably be delivering to a distribution center, where the supermarket then has to pay for that storage, plus labor to re-load onto other trucks, ship to the supermarkets themselves, and unload again.

Your analysis is missing nearly everything. Driving the full truck from point A to point B is a tiny part of the process, cost-wise. And I'm sure I've left things out too.