It's also more subtly curved than most people give it credit for. I know a guy that is creating 3D models of the truck for some people that want to simulate it in simulated wind-tunnel. He was flabbergasted at how much they could keep the straight looking form while also smuggling in critical curvatures here and there to stop eddy currents from forming.
In any case, it's impossible to stop eddy currents from forming. Any car, even if it's as slippery as a LMP1 prototype, will generate lots of turbulent eddies. The question is, how bad will the drag coefficient be.
And that's a question you won't be able to answer with simulations unless you have a few tens to hundreds of millions of CPU-hours lying around.