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Rock Lizard Fabrications' Gecko Rails or Basket rack would be the only way to go right now (and it's a good way to go too!). http://www.rocklizardfabrications.com/Liberty_gecko_accessories.htm
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I have a one-piece aluminum rack built by a guy on L.O.S.T. Jeeps, but apparently he and his products have dropped off the radar (Tommudd on this forum may be able to get a hold of him).http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=34&t=47811
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DO NOT try to use the factory roof rails, they are plastic and will fail, ask me how I know!
That is dynamic weight i.e. 150 lbs with all the wind force from driving, etc. Static weight is usually much higher I have always applied a factor of 3 (don't remember where I read that, but was someone else's number in regards to a RTT)