Yup, you are right about the loader (max 60k lbs for tunners or
something like that).
I disagree on the modification bit though (won't take that much
time and effort and certainly not as much time and effort as
building new C-17s). Its not modifying the entire aircraft and
loading isn't that major an issue to overcome (80 ton cranes to
lift MBT onto a constructed fixed platform capable of carrying 6X
tons at fuselage height). Commercial solutions include:
100 ton Lifts:
http://www.nauticexpo.com/prod/paolo-de-nicola/travel-lift-23347-185523.html
100 ton pullers on the platform.
http://www.posilock.com/100_Ton/100ton.htm
But the difference in opinion is irrelevant per below so I won't
go much into it.
Seen the cost of a C-17 lately? US$350m each....
http://www.dsca.mil/PressReleases/36-b/2008/NATO_08-32.pdf
Ultimately, its far cheaper to buy 24 new Leopard 2s and base
them permanently in Australia just for training (probably cost
US$100-200m or something) rather than buying transport aircraft
just to ship them back once for an event ie war that may not happen
(or even to do modification, if required). MBT numbers not that
significant just to justify the transports. Nah, ultimately still
commercial shipping or even LSTs. DSTA/Mindef aren't dumb.
Some interesting links on the issue from CK & gang (aside
from the standard rhetoric, there are some interesting facts):
http://www.ausairpower.net/wp82-draft.pdf
http://www.ausairpower.net/May-the-Force-Be-With-You-Cooper-P.pdf
http://www.ausairpower.net/API-Tanker-2000.html