(I tried posting the following post as a comment, but it was too long, so only the first half is a comment. Here's the whole post)

I really wished...

1) ...the mod instructions make it clear you can't rely on regular goods stops with this mod.

*** THIS MOD IS UNIQUE IN THAT YOU CAN NO LONGER BUILD YOUR TOWNS LIKE YOU'RE USED TO ***

(Why not state this clearly at the start of the mod description??)

Regular goods stops only support dropping off goods, and this mod is designed around the idea that city buildings now generate goods. This means you WILL HAVE TO place goods terminals around your city to cover your residential, commercial and industrial zones. This is different from all other goods!

2) ...the mod was changed so you could use regular "goods stops" and not have to change the way you play the game. I tried this mod, but I find it off-putting to have to build goods terminals to collect stuff from inside the city.

Specifically, if it is possible to mod the goods stop roadside building so trucks can pick up mail and waste during the same runs they deliver their goods. There is a mod (forget its name) that adds compartments to trucks, so one truck can hold some tools (or whatever) and some mail.

What you want is

a) that trucks start out by hauling only the good they deliver to the town, then gradually pick up mail or waste as space is freed up in the truck, and at the end of the route through town, the truck now hauls mail/waste back to the goods terminal, where it can be loaded on a train etc etc

b) not having to change the way you build your towns; specifically not having to place big ugly goods terminals INSIDE your cities.

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To be honest, if the roadside goods stop can't be modded to pick up goods, maybe it's better to redesign the mod away from the "city buildings generate stuff" idea altogether...

Anyway, wanted to make it clear what isn't obvious from the mod description - that the mod won't work if you don't change up the way you build your cities: you need to place goods terminals all over your city so their coverage covers the city, and you probably need separate goods routes (or loads of trucks) to make it work (since default trucks can't carry two types of things; a technical way of saying this would be "they have only one compartment")