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Old 06-19-2020, 03:01 PM   #5 (permalink)
JSH
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Join Date: May 2009
Location: PDX
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Adventure Seeker - '04 Chevy Astro - Campervan
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What kind of truck are you driving?

Trailer tails are good for about a 5 - 6% fuel economy improvement on tractor / trailers. They should work on a trucks too. The fancier ones automatically open and close based on speed. Basic ones are about $2,000

Side skirts are more popular because they are cheaper for the same 5 - 6% improvement. They are about $800 (That is US testing - I don't know how the side protection required in the EU effects aero)

Wheel covers are the cheapest but lowest gains (1%) They cost about $300 for a set of 4.

Combined you can expect about 12% improvement.

Trailer Tail:



Side Skirt:




Wheel Covers:

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