It is covering a rear rack which simplifies mounting and eases any concerns about overloading it. I'm not sure I'm going to keep it with the low profile though. My other ones were taller and held quite a bit more. I'll see how it works for a couple of weeks.

You'd be surprised how "getting aero" can winterize a bike. In my scheme though aero is secondary. ie, if you're going to make it comfortable for winter riding, why not make it aero while you're at it?