What is the largest aircraft (by max takeoff weight) in which all engines are in the tail?
I think you've got it. Surprising to see how much larger it was than the VC.10. 

There was a planned development of the VC-10 that used the VC-10 wing and tailplanes with a new double-deck fuselage. This VC-10 Superb (DB.265) had a planned MTOW of 174 tons.