In the older generation of tankers, tanker/tanker refuelling was frequently necessary, as max takeoff fuel was far lower than the sort of figures achieved by more modern tankers.
In the case of the Victor, it was the co-pilot's job to shuffle the fuel around using a splendid fuel tray which was situated between the two pilots. Doing a 25,000 lb transfer, for example, could obviously involve large shifts in C of G in both tanker and receiver, which the co-pilot was responsible for taking care of.
Sorry I can't work out a link direct to the appropriate photo, but scroll down to see a nice pic of a Victor K2 fuel tray, which stows away neatly when not required
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