This will ease things a bit :
Haulmark Trailers - Cargo Trailers - Bumper Pull Trailers - Transport 5' Wide
The front and sides seem to be radiused already, which is good.
You can buy "dust" plates that go between the wheel hub and the rims.
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Some sort of trailertail device TrailerTail | ATDynamics would probably be the biggest bang for the buck but it'd take me a while and it would all be custom.
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It'd be about the best mod you can do however ...
A crossflow plate on the centreline - or a series of smaller plates - on the front of the trailer would also help.
These prevent or reduce crossflow between the towing vehicle and the trailer, reducing drag.
Just don't put them too close to the sides.
Anything that smooths out the squarishly protruding wheel fenders would be OK - best in 3D, but even angled flat plates would help, and can cover the wheel arc in one go while you're at it.
Don't add any cylindrical shapes to the rear of a trailer.
They add drag and reduce stability - google "coanda effect" to see why.
A sharp cut-off line at the rear is OK.
Higher tyre pressure, as long as it doesn't make the trailer bounce.
Higher tyre pressure can also be applied to the tow vehicle as an invisible mod.
You might like the sharper handling
