Alloy for weight reasons
Low profile is good to minumise wind resistance, but consider making it out of round tube (the front rails at least) to get rid of some wind noise. My last (ARrack whistled like crazy just on the 100km speed limit.
I prefer an open rail. this provides an abundance of tie-down points and can be sheeted if a full flat deck is required.
Having flat vertical surfaces (supports for upper rail) allows awnings, shovel, accesory mounts etc. much easier to fit.
my 0.02c anyway.


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rack whistled like crazy just on the 100km speed limit.

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