The Bus Trunk is at the rear of the abandoned buses, as opposed to the side-mounted Bus Side Trunk. It's a similar concept but more common to find than the Bus Side Trunk making it a container you'll encounter on a broader range of runs. The loot pool is heavily rusted salvage: Rusted Tools, Rusted Bolts, Rusted Gear, and Rusted Shut Medical Kit make up the bulk of it, but other mechanical and electrical items can spawn in it. These can be high-value depending on what items you are fiending to craft or project you are trying to complete. Compared to the Bus Side Trunk, the Bus Trunk doesn't require breaching, giving it a lower barrier to entry while having a similar loot pool. Worth looting? Yes, but with expectations set accordingly. The loot pool items have their crafting uses and Light Gun Parts are always welcome, but you're not going to pull anything exciting here. I honestly would loot these if I have time and space because the crafting materials stack up nicely over a long while and you always seem to need them when you don't have them.