A330 MRTT can carry a lot more than 28 stretchers!!
Indeed it can,
3engnever!!. The fit to which I referred was the 'intensive MEDEVAC configuration' with 6 critical care modules also fitted. In the maximum stretcher fit, according to the tech specs it can carry up to 130 standard stretchers.
All without compromise to the AAR capability and without any loss of space for any additional centre tanks......such as are needed by the Frankentanker.