AEC Mammouth

During the late 1950's Park Royal produced cabs and some trailers for various AEC chassis at volume production rates. Here is an example of a fibre-glass cab on an AEC Mammouth Major chassis.

mercury-1.jpg (33729 bytes) I am uncertain of this cab but my guess is that it is a Park Royal cab, similar to the one above, mounted on a Maudeslay chassis that would have almost certainly been a badge-engineered AEC (probably a Mercury or Mammouth).  It was most likely destined for the commercial motor show in 1959.  Does anyone have any knowledge of this vehicle?

And another trailer for extremely important, mission critical and precious loads.