Well, yes, MrB.......
A310 was the jet to have bought - you try finding any ex-airline A310-300s these days! Snapped up as soon as they become available.
Around 4.5 tonne per hour rather than 7.5 tonne per hour and with a 71.5 tonne fuel load - or possibly 77 with a 5th ACT and MTOW increase? But a bit limited if you want to carry full fuel in terms of pax/cargo potential as the available ZFW is somewhat limited.
Fictional Strategic Tanker Aircraft does seem to be getting close to the buffet of procurement, from what people are saying on this thread.