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@jakobnev, no, there's no lift so three of the four sides are 'clean'.
@freebeard, j-c-c, on passive porosity, maybe that's something like the porous 'silencers' on some pneumatic systems which allow air to pass through for (eventual) pressure equalisation, but not tumble, shear etc.
I think those are metal or ceramic, so not very practical for the back of a truck. No reason though why other materials shouldn't work. There seem to be some papers out there if anyone wants to dig.
@freebeard, I've also seen dimples and riblets for flow adjustment. Too many holes in your vehicle can lead to unexpected and fatal results!
Back to the o.p., I'm inclining towards vanes with v.g.s
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