I look forward to reading your report!
As far as function..... I did a research paper in college about vortex generators, which at the time were being marketed in aviation applications. Those look different, but these air tabs perform a similar function.... adding energy to the boundary layer.
I found this little graphic with the help of google
On a wing at high angles of attack (pitched up steeply), the airflow separates from the surface of the wing causing turbulence and loss of lift. These little tabs create a little vortex, sort of a small tornado coming off each tip... so this added energy helps the airflow to conform or stick to the wing surface better.
So I suspect that these airtabs, each of which look to produce two vorticies, would in an RV application help the airflow to flow behind the RV rather than folding into the low pressure area behind the coach..... or between the cab and trailer of a semi, or a Toad or trailer, etc....
So, to Beacher's point.... they can actually change the shape of the coach, but aerodynamically, into a more clean shape. My best guess is that it would be sort of similar to adding a fairing to the rear of the coach, similar to the bike helmet
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