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unsub1
i like them a lot. makes loading the tent so much easier. it took a bit to get them all lined up but once you have it all marked and ready you are set. drop tent on top and slide it in. i had a gobi rack before and had to bolt cross bars down, it was such a pain getting my hand under there. no scratched up knuckles with these. i was surprised how easily the tent slides in, i was expecting it to be a little snugger.
cons: they are noisy when a tent is not loaded. they jangle around quite a bit. i tried using zip ties but didnt help. i removed them for winter.
they get dinged up pretty easily. on mine the powder coating is chipping pretty bad just from one summer.
your tent sits up a little higher. i dont notice any extra road noise but there is a bigger gap.