Autocar U4144T, Truck, 2 1/2-ton, 4x4 Tractor with registration RNF-35.
It is towing an Army Air Corps 2000-gal. fuel-servicing semi trailer with registration RNF-37.
Seen here fueling a B25 bomber of 18 Sqn NEI-RAAF. Location and date unknown to me.

Source:
https://www.facebook.com/groups/400112376713418