With the exception of "Space Trucks" this is almost a point for point rewrite of the discussion of space commerce in the old Star Wars West End games source book. Nothing wrong with that though, the cosmic era is about folding in things from other genres and the convergent evolution of speculative fiction.
But lets get down to the juicy details. How much space traffic do you want there to be in the cosmic era? I thought that humanity had not yet left the solar system in the cosmic era and the alien invasion had not happened yet. Yet you mention stuff "Most of the container ships are involved in terraforming operations". How many terraforming operations are going on in the solar system? How many people live an extraterrestrial lifestyle? Are they self sustaining yet?
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But also might space hauling be more like log flows. Let us say you have harvested and lumped together using some sort of ionic net 400,000 tons of carbon floating about 10 million miles from the rings of Saturn and you want to get that stuff to the Solar powered molecular fabrication plant (takes carbon and then builds super strong material from the atom up) sitting behind Mercury. How much energy do you need to get that 400,000 tons of carbon there. With a geeky dose of planning and one good push, couldn't that chunk just move that way without a lot of course correction? How much energy and time do you need to invest in order to ensure that there are course corrections? How long will it take?