Hot Pits !
Even in Hot Pits, Ord was never loaded at the same time as fuel. First Fuel would be taken on, then the truck moved and Ord would be put on, or the other way around. While not everything was done to SOP in war time, understand that there where times when bombs would explode during loading from being dropped or what not. Why would you take the chance to take out your pilot, plane, crew AND your fuel?
As planes never took off Solo in combat situations crews would be fueling and loading ord on differnet planes at different times. But as far as we where taught and from what I have seen in modern day combat sorties even on the LHD, Fuel and Ord was never done at the same time, even if it was done in the same place. It was just a mixture of 2 possibly dangerous actions together.
So if you want to "think" reality, when you hit the rearm pad, just think that the frist 15sec they are loading Fuel and the last 15sec they are loading ord...there done

Also on sotries to take down bombers normally it was just cannon rounds and fuel neither of which take very long, but due to the location of both the fuel and ammo loading area's on most aircraft they still where done seperatly. But pretty much back to back. or they would load the rounds in one wing while the fuel truch was parked and fueling from the other side.