Aren't there cargo hauling missions on the mission boards at various cities?

I just got a delivery mission that wants me to collect 5,000 argon. That'd take like 25 trips in my current ship.

Yeah as others have said there are missions to haul stuff from A to B. Also, it's nice to have a bunch of space for all the resources that I usually collect. At this point I have about 10 times the total carry weight in my cargo space.

I use it to stock pile ressources (for crafting things, upgrading equipment...) until I onload in my outpost containers. They are heavy.

Your ship can only hold so much stuff. If you plan on utilizing resources for building, you might want to invest in a ship with very little hab and storage containers all over. I'm struggling to have things on hand with 3000 cargo space. 😩