Does it have a supplemental fan? If so, you could proceed with a tail design anyway. Usually there is too much airflow over engines and through radiators, lots of wasted drag.
EDIT: I will be drawing up my folding boat tail design for my 5th wheel in the next week or two. It is a little shorter in height than your MH, but just as wide and blocky at the back.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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