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It ... would probably revolutionize the travel trailer industry, cutting feel costs in half or more.
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So are you trying to save fuel or revolutionize an industry. Because I'm totally down with the latter.
If you want to save fuel, put a
Fisher & Paykel washing machine motor outboard each hub, restrained by a trailing arm.
There was a thread about that when I first joined, I can't find it now but I did find this:
copenhagen wheel project. By "small and lightweight" do you mean no heavier than two bicycles and their riders?