Why my truck route doesn't work?

[Shieet]

I'm pretty new in truck jobs so i don't even know what i do not understand.

My route starts in Jeoji Plastic that supplies plastic pipes 6m, then it goes to Jeju Construction Site that demands these plastic pipes. Nearby there's Jeju Airport that supplies with pallets that i'd like to pick up to go back to Jeoji Plastic that demands pallets.
All of this supposed to be done with flatbed/box.

So in my head it looks like good route and repetitive circle that i don't have to care about that much.

But as i see it never pick ups ANY cargo no matter what i tried.
And I tried Kira-Flatbed, slightly larger Maity and lastly Kuda with borrowed flabed trailer.

I am out of ideas what to do now. I need help

[-Bullet-]

You need to supply the crude products first before you can get pallets, pipes etc.

Get your crude oil from Oji Drilling to Sanho Oil Refinery, refined oil to the plastic factory and then you get the pipes. For pallets you need to deliver containers to warehouses.

[Shieet]

Ahh, that's what i missed... Okay looks i need bit more plan for all of this.
Thank you very much!

[NiceGuy]

It's best do drive your desired ai route at least one time by your own. So you can see if it can work and how it works, what is needed to make it work, which destinations are available, what truck is suitable...