Mack,
Entrance angles of what the 34P's have are reduced by the bullbars, chassis hardware and other crap hanging off anyway. If the entrance/exit angle as you are saying is required, i doubt the Izuzu and Hino chassis have the torque or horspower to drive up any hills/creeks/whatever that steep. The 34P has an entry angle of 32 degrees. Thats steep yes, but could the vehicle safely and practically operate on such terrain? Clearance wise is limited by the axle height (being a live axle design (simple and cheap)). This is less than 500mm on the 34P's, where as the base of the doors to crew cab are at 1400mm.
I for one did not imply that the CFS is trying to be impressive, however thier choice of chassis i think as pip eluded is based more on price than function and safety. (correct me if i'm wrong pip!).