I had a Vaude universal bus tent, but we didn't use it that much since we don't stay in one location that much.
But the problem is you will never have a nice seal against musquitos. Although this Vaude bustent also had an interior tent for it, making it more expensive. And it was meant for the rear, not the side.
It would be more practical to have an screen for your side door. We are going to try such a walk through screen (with a couple of wide strips/nets hanging down). But I'm not sure if it will keep all of them out.