I was too excited to wait, so I took it for a test ride tonight. The cooler has my rain gear, tools, and warm base layers in it. Driving it feels like I have my daughter on the back, but with a different center of gravity. Acceleration didn't get reduced much. At 65 mph, it has a slight wobble. I'm not sure if it is due to the cooler, or if something is a little loose, or [my best guess] the wear on the tire is making it tip from one side to the other. It seems to have some camber wear on one side more than the other. The picture is a little blurry, but you can see it. More slope on the right side.