I imagine the gear reduction in the diffs would relieve them abit, but yeah with 20+ tonne payload into the bargain as well as the gross vehicle mass, the forces would be great.
Abit of trivia. The engine in this is a bored out version of the 590 cubic inch (9.6 litre) AEC diesel used in most of the famous red rear platform deckers in London you still see on post cards. The one on the truck is the 760 ci version (12.4 litre) and turned out a very reliable unit, though relatively sluggish compared to a modern truck.
