The automated freighter "Electric Magnolia" lights its fusion drive near the main belt asteroid 16 Psyche, the largest metallic asteroid in the Belt and a major source of metals for the Jovian and Saturnian settlements. While those metals are often shipped in bulk with huge laser sails or mass driver projectiles, freighters like this carry refined goods such as prefab structures and machinery to worlds like Mars and Ceres.
Being a newer spacecraft, its fusion drive also provides electrical power, something older fusion rockets were not able to do. In the past, many fusion-driven spacecraft relied on solar or fission power supplemented with fuel cells for back-up power. When power conversion technology became small and cheap enough to mount on a spacecraft, fusion-driven rockets were able to tap their drives for tremendous amounts of power, vastly increasing their operational ranges to far outer system where the Sun shines dimly.