They don't generally model these things for RVs, but do for semis, trucks and buses. RVs aren't that different though.
Box truck:
Truck Aerodynamics - What & Why? - Aerodyne
The yellow and red are higher wind velocity areas, green is relatively low, blue is very low. You can also see the vacuum at the back of the box from this too.
This paper discusses the aerodynamics of several different configurations of bus:
https://iopscience.iop.org/article/1...2/1/012002/pdf
In several of them, the low velocity area over the roof is pretty clearly visible (esp. Figures 2, 4, and 6).
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