If you can see your holding tanks, unless they and the dump valves/piping are electrically heated your unit isn't set up for cold weather camping. While I wouldn't worry about 30ºF or even 25ºF for a couple hours anything lower than that is likely to cause you problems.
If you're serious about camping in the cold you can add the underbelly cover and an additional duct off your furnace or electric heating to the tanks/plumbing to make it more cold friendly.
I love camping in the cool weather. I know that probably sounds funny coming from a guy from South Alabama.
but we really do. We usually camp either Thanksgiving or Christmas somewhere in the mountains.