The trouble is ; that Kenworth refuse to Fit it to anything..
They've just released 2 new Models at the lower end of their range.
The T410 is MX13 powered only & the new T360 is ISLe5 powered only whereas the previous T359 also had the ISMe5 as an option. which was very popular with car carriers & quarry companies..
Freightliner will (I suspect) use the 11litre Benz Motor.
Which leaves Western Star,& since Roger Penske has taken over the Distrubution rights here. Is a Mere Shadow of It's former self. They do however Sell X15 powered versions of the 4800& 6900 here.
So a X12 powered 5800 is a possibility ...& would sell well, in my opinion.
Foton (Who build the X12) have had a Small presence here for a few years selling ISF powered Utes(pickups) & light Trucks, & have just released a medium Truck powered with the 6 cylinder version of the ISF maybe some time down the Track they might bring their X12 powered Primemover down here..