Quote:
Originally Posted by Frank Lee
That cap in the background... it's already made. Often there are plenty of them to be found on Craigslist free.
It's big, thirsty, and un-aero.
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If you're towing an enclosed trailer (or one with a tall load), a square cap is better than an 'aero' type. Adding a deflector to kick air up to the roof height of the trailer is better still.