Just found something interesting on the DMO website when I was researching LAND 400.
Defence Materiel Organisation
The attached PDF "LEWG Presentation 11 Nov 2013" includes the proposed load outs of the Canberra Class LHDs, including one slide showing what appears to be ten folded Chinooks on the upper vehicle deck and another with 13 Abrams on the lower deck and another with 42 IFVs on the lower deck as well as the dock area.
Haven't read all the PDFs yet but thought I'd link the page for interested parties to have a look for themselves.