EastCoastMojo wrote: How about a 3 foot tall driveway marker with a 1 pound weight as a base that you can sit on the line and drive the car up to until you see it wiggle? (Image not to scale) Just fill the center hole of the weight with epoxy and insert the driveway marker, secure it in place until cured, then you should be in business. Better yet, make it collapsible by epoxying a tube that is just large enough to slide the driveway marker into. Maybe make a few of them to expedite the parking.
I like the idea, but there are typically 20ish cars in each row, ergo we would need 20 or of these. Out of budget, and more difficult for one person to move than what we have now.