Truck-related quandry

I drive a Smart ForTwo, and I love it. I can pack it to the gills with stuff, and it seems to do just fine. I moved 7′ oars with it. Purchased and brought home a bed from Ikea with it. Including the mattress.

However, this weekend I need to bring home a sheet of 3/4″ plywood.

The car is 8″ longer, and 18″ wider.