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The real textbook on how to make a van more aerodynamic was done by NASA Dryden back in the 1970s/80s:
A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities
(Oops, first post, so can't link to file - google 88628main_H-2283.pdf and it will get you to their report.)
This has lots of scientific testing of real-world(-ish) aero mods which will teach anyone something - for example they tested a full boat-tail and a truncated one with precious little difference (Cd=0.242 v Cd=0.238).
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