yes i did bye a nother compony but it will give me money if i tell it to load at both places and just tell it to skip when it gets done unloading but thats a lot of work
i think: don't unload!
where some transport "machine" needs to pick up stuff, click "full load"
where it needs to put the stuff down, don't use "unload" - that's only good for feeder services... imo of course.