This would be nice so you can bring your gun train out to a place you want to clear and be able to setup defences before firing instead of it unloading the moment you park

Note that a pump does not pump from a tank. The tank naturally flows into the pump input fluid box. The pump then "pumps" that fluid to the output fluid box where it again flows naturally out of the pump. To do what you describe would mean changing the generic fluid box. I see that would ...

I'm currently working on powering distant outposts using oil fractions by sending out whichever of the 3 fractions I currently have the most of. The (presumably empty) train is filled with a fraction and heads out to all the outposts that have less than 10,000 petrol+heavy+2*light. When it comes bac...