On a smaller scale, some of my hot rod buddies use aluminum pipe with rubber hose on each end. If you did this, you could possibly use a 2.5" pipe with a 1/2 inch up on one side and a 1/2 inch down on the other. I haven't tried it personally, but maybe you could perfect the idea.
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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