One problem with using self inflation only is that it could deflate and drag on the ground when you stop or it could get burnt by the exhaust. Also if you drive in reverse it might get stuck under the rear tires.
Either the boattail need some way to stow automatically or it needs to stay inflated till you can stop and stow it manually on the street outside of the parking lot. A one way valve could keep it from deflating but a release mechanism would still be needed. The only completely passive way i could think of that would work would involve some sort of spring that would stow it away at low air speeds and let it self inflate at higher speeds. I haven't figured out how such a stowing mechanism would work.
For rear visibility i would install a camera on the back of the boatail. Of course i plan on having a backup camera and no windows on the utility cap anyways so its much less an issue for me than others.
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