On the Freightliner I just ordered for my NRC Motorhome conversion I specified the Meritor Freedom transmission. It's a fully automatic "manual" transmission with no clutch pedal. It's a 12 speed that handles the 1550 pounds feet of torque of the Mercedes engine.
The Meritor senses the load and via computer controls skip shifts as appropriate. The computer and electrical/hydraulics acctuate the shifts and controls the clutch.
You can get a lot more info on the Freightliner web site.
I don't recall the price but compared to an Allison was very inexpensive.
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