The January/February issue of Truck Trend (cover and pg 22) has a one-off truck built for SEMA that has an 8 liter Hino backed by an Eaton 5 speed. I haven't found it at
www.trucktrend.com yet...but, it's a very interesting truck. If they boost the power, currently listed at 260hp 585 ft lb (and an auto), to match the big three they might just have something that could be a very workable truck...5th wheel capacity is currently estimated at an F450 like 24,500 lbs.