On the Easycoast Viewliners they have been "experimenting" it seems. Could be wrong but, On the trains in Dec, Jan, Feb and part of March the sleepers were in the rear. In later Mar and Apr they have been in the front. When in the rear the baggage car was moved to the end of the train for about half the time. (Feb, Mar)
I like the sleepers on the rear better then on the front when in them. But, only when the baggage car was on the back which helped in minimizing the back and forth swaying.
The downside is that the trains seemed to need to reposition 2x-3x at some stations to accomodate the sleepers and baggage in the rear of the train.
Thus despite the "better ride" on the viewliners in the rear with the baggage at the rear I think we will see them upfront.
One nice thing was when the sleepers were in the rear and the baggage up front you had a neat view from the back sleeper rear of the car.