I hadn't seen those, but they seem oriented to smaller vehicles.
The Aerodynamics of Heavy Vehicles_ Trucks, Buses, and Trains - Google Books_files
Some discussion after Permalink #33 in
http://ecomodder.com/forum/showthrea...tml#post459937.
The significant work done by Englar at Georgia State is paywalled. Is that what you're thinking of? At least some of that is in there.
I use PMs for administrative stuff, and I see other use them to go off-topic from a thread. If you get your info via back channels, then the lurkers go wanting.
Doesn't anyone think of the lurkers?
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There's also the Aerodynamics section in this [first] post:
http://ecomodder.com/forum/showthrea...pers-1814.html