The armor units have Marmon Herrington tanks ... the tanks instead diverted to Australia,
arriving throughout April and May 1942.
By then the M3 Stuarts and M3 Mediums were arriving. Better to use those. They floated the M3 lights round to Buna in 1942 on barges, IIRC.
In 43-44 the venerable Matilda was preferred; compact, well protected, speed was a non-issue in the jungle role, and plenty of them had 76mm gun-howitzers (and late war some flame-projectors) instead of the 2-lber . Having said that, the armour piercing performance of the latter made it useful for shooting at log protected bunkers and such-like. Think of spalling, except with jagged hard wood splinters.
Late war, after jungle trials of the M4 and other possibilities in Papua, we ordered the A22 Churchill (again, a mix of 75mm, and in this case 95mm CSH types; dozer blade kits were being manufactured locally, but I am not sure if any crocodile attachments were in the pipeline). Despite its looks, it had remarkably good obstacle crossing/hill climbing performance. An order which was promptly reduced from 500 to 51 in September 1945.
Those were eventually replaced by Centurions with the 20lbr OQF rifle (84mm). In 1968 in the wake of Tet, the tactical commander of the ATF at the battle of fire-bases Coral/Balmoral, Colonel Don Dunstan, employed his Centurions just like he used the Matilda attached to his platoon when he was a subaltern in Bougainville in 1944-5.
"You may find that having is not so nearly pleasing a thing as wanting. It is not logical, but it is often true."
- Cdr Spock