G'day Phoenix
That pic of 170-566 looks like it was taken at Bandi Museum, going by the 40/41 Ford in the background, and on that vehicle the tipper side -to -floor is a square fold, whereas the tipper pictures by dkg000 has curved side-to-floor profile, I think it may be a Teaspoon Tipper body fitted to a Mk3, also it has smooth sides and not the ribbed sides of 170-566, if so it would be a little bit of a RARIE, the shape of the rear body gives the impression of Teaspoon, it could be that from this build-up that the F2 was conceived
note also the rear mudguard configeration, with the longer side forward, possible for the rear tipper body hinge clearance.
Doubt it is an F2 body retro fitted to a Mk3.
cheers