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1,478 Posts
Steel is going to be the strongest. I've got a urethane kit and it is very beefy, looks great and serves it's purpose. I wouldn't go with aluminum just because there is no reason to. I doubt it's any different than the urethane kits strength or weightwise. I like mine quite a bit but I'm not jumping my truck or entering it in the baja anytime soon, if I was I might go with steel.
