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Most trailers are pretty bad for aero, so aero treatments would most likely help. Small things like smooth wheels would likely have a small benefit on, say, a 30ft trailer, but in a smaller trailer molding the front, sides, and rear similar to the aero template would likely show some benefit.
Obviously any ROI would depend on how often you use the trailer.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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