non of the above.
its to do with aerodynamics unfortunately.
the van back causes a low pressure area of circulating air that causes all the road grim to get stuck to the rear doors/tailgate.
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i believe the technical term for it is called wake vortex and drag coefficients
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mudflaps wont help out with this one - just regular jet washing to keep it clean.
(This is also why most estate cars have rear wipers, yet the normal saloon version dont, its to do with the flatter angle of the rear window with regards to the floor and direction of travel. --- The saloon has better aerodynamics which keeps the air flowing faster so the dirt doesnt get stuck to the glass. )
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