An idea i had was to make a boat tail as low as possible and ideal. And hinge the last two feet of it at the bottom, then place an omni-directional shopping cart wheel at the very end. In the 5% of instances where it would scrape, it'd just lift the rear up and then springs inside would tension it back down. Then you could have a 100% boat tail without worrying about the few situations that would be catastrophic.
Second hinge at 50% at the top. This hinge would have latches so you'd pull into a parking spot, then fold the back half of the boat tail over the front half forming a rectangle or square instead of a wedge. You could parrelel park now or just get the boat tail out of traffic.
The ideas that'l never cause i don't know how to build things!
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I try to be helpful. I'm not an expert.
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