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My guess is the round Yakima bar might be less prone to bending than square Thule bars but that is just a guess.
I don't think the stock rack bars are rated for more than 125lbs and they flex with just my 80lb kayak on top.
For Yakima you will need control towers if you want to use the 4runners stock roof rails. Use Q-towers if you want to mount it over the doors instead, or a combination Control and Q-towers if you need a longer platform. As Corey showed you might need more than two bar to distribute the wieght.
That aside, while a cool little contraption why not just use a regular tent? You would be less topheavy and small two-person tent take up very little space in the back (at you don't have to climb 6 feet when nature calls).
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Carsten
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99 4runner SR5 4x4 5spd
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