Awning size; wheel lug nut size

Hi We are new to this. Just purchased a 2015 Int'l Serenity 23FB.

I have a few questions:

1. What size is the ZipDee awning (door side)? I need to get an astro turf mat.

2. What size are the lug nuts on the wheels? How do I tell if the wheels are steel or aluminum?



Thanks