this game is so loving stupid, literally, you have to set up everything exactly correct or your dumbass trucks will just drive around and will drive around the entire 14 truck stops without picking stuff up. what the forget man
you dont just build things and cross your fingers that the vehicles visit them.
you have to open each vehicle up and set the stops they make. and other options like full load, or drop off only, or other such things.
for trucks its usually pretty simple.
1 go to bisjac city woods truck stop (set to full load)
2 go to kalphiter'ville lake truck stop
income is made, and that truck goes back and forth to those 2 directions
full load options (when at a station that they need to pick up from) i use on nearly all trains and road vehicles, not usually planes.
drop off option, you do not use when simply delivering something normally, its only for using a middle-station in a complex cargo line.
and you cant just place stations anywhere, you gotta hover the tool near things so you know it either creates a thing you wanna transport, or accepts one.