it's a large flat bed truck, right hand drive, single axle dual wheel, I think is a 1941 it has what we call a Colonial Cab, that is a cab made in NZ, I have been told they imported the trucks to NZ cowl forward in 41 and made the cabs here then started to bring them in to NZ complete in 42, the doors on the NZ cabs are timber frame and have a tighter curve on the upper rear door corner, the chassis number on the original ownership papers are written as XHMS 34053, I assume the model is the XHMS and the chassis number is the 34053, I think it may have coame out of the Oshawa plant but would like confirmation. If I can work out how to post a photo I will try to add a photo so people can see it
