[Christ]

So what about an umbrella frame deal?

Couple pieces of tubing that slip inside each other to make the main "handle" section, a ring that slides up the tubing to open the "chute" section, could be made of thin rods and fabric, would fold up in seconds and could be stuffed in the trunk with no problems. A quick PCV tube frame could be attached to the hatch to connect the loose ends of the fabric.