I have never owned a Fuso but I have owned many 4wds over the last 50 years from Landcruisers to a U500.
I strongly agree with the comments re increasing low gears. First thought is adding an Atlas 4 spd TC.
When I purchased my my U500 chassis it was the only decent 4x4 medium-heavy 4x4 chassis sold in the USA that had any hope of parts/service in most countries. It is true that it is currently a bit of an "orphan" in the US but that does not mean I can't get parts; I get them quickly from Merex in...
EPC is electronic parts catalog
Try putting “WDB” or “WD7” in front of the 14 digit number
385s are about 10% taller than the 9R22.5s. But you will need single ~11.75” reversible rims to get the tracks about equal.