VW Corrado's had rear spoiler that came up at 45mph, down around 5 or 15 to improve rear visibility at slow speeds. Turn that style mechanism around to go down. Rubber garden edge trim is cheap and is self clearancing.
would an air damn back at the edge of front tires be better than none at all? air would pack from it to front bumper under car, but less chance of getting damaged. Seen production cars like that. GM comes to mind.
Cars with air suspension can easily adjust ride height. But most cars have changes to alignment and suspension geometry as ride height changes. Set alignment at traveling height, the change to toe/camber/caster might not cause too much tire wear below 5mph at parking speed when height goes up.
Personally, I prefer K.I.S.S. Keep it stupid simple.
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