A truck shows up, waits, gets a door, gets loaded or unloaded, and leaves. That's the same whether it's carrying ice cream, drywall or auto parts. ROME is built around that visit, not around one industry, and you set it up with your own doors, hours, shifts and delay reasons.
Your doors, hours, shifts, trailer types and delay reasons are set up for your building. Nothing in ROME assumes what you ship.