Noob question about truck routes, multiple stops from one supply point

[Zulban]

So I've tried to look up what a decent truck route for AI is and I found one person suggest having a semi with a cargo trailer deliver containers to a meat plant, then have a flatbed of some kind deliver from said meat plant to a grocery store.

However, I noticed that when the containers get delivered the meat plant generates products for several destinations, including the burger and pizza joints near the grocery store. Right now the flatbed is only delivering maybe 1-4 boxes of meat on its trip into town and I'm wondering if it's possible to increase efficiency by adding the pizza and burger joints to the route since they take the same cargo.

My question is this: if I have an AI truck load at a supply point (I.E. a meat plant) and tell it to stop at multiple potential demand locations (Such as a grocery store, burger joint, and pizza pit, all in a row) before returning to the supply point, will they be intelligent enough to load up as much as they can for each of the demand locations? Or, will they only load stuff for the first stop on their route and then drive the empty truck to the rest of the stops before returning to the supply point?

[-Bullet-]

They unload at the first stop as much as they can, delivered products will take time to process though so it should level out with time.

[Praxis-W]

I've been having my trucks return to the supply point between each delivery. I don't know how efficient it is, but my town ratings keep going up and those routes always make a profit.

[NiceGuy]

Yes they do load as much cargo as they need to fulfill all demands on the multiple spots. But only until the cargo space of the truck is full. So be sure to have a big enough truck.
1. Also keep in mind it takes some time for the destinations (store, pizza, burger) to consume the meat until they take another delivery.
2. The meat plant also takes some time to produce meat from the delivered containers and production facilities have only limited storage capacity. So be sure to get rid of the produced stuff before delivering more containers.
3. Production like farms only have a storage of 10. So having a big semi with space for 20+ to collect stuff will end up drifting half empty.

[Zulban]

I figured out one of my issues. When looking at the shipments ready in the meat factory it was listing the burger and pizza place of a completely different town next to the supermarket I was supplying which made me think that there was just a bunch of stuff the driver refused to pick up but I was simply misreading the names. I guess I'll have to get a truck to start shipping some of the other meat elsewhere because right now just supplying the two nearby grocers is barely breaking even since the pizza and burger places are constantly full and aren't taking shipments, leaving pretty much one crate being delivered at a time to a single location.

Now I thought of having a more complex route where the driver delivers stuff to one city then goes back and focuses on a different city, but I assume that the driver is going to always try loading shipments for the first destinations on the list even if they aren't scheduled to go there for another 10 stops.