Tell them about everything. The screws holding the skirting are notorious for coming loose. There are a number of ways to deal with this problem, from using silicone caulking on the threads of the screws after they are installed to using flat spring nuts, which is what I have used,
https://www.lowes.com/pd/Hillman-4-C...g-Nuts/3013171
I would not expect the dealer to add these to the screws, but you can do this fairly easy.
The squeaky floor may just be one of those things you will just get used to, just like in a stick and brick home.
There have been issues with water intrusion from A/C installations, and the bubble in the in the slide may be a problem that must be checked.
Good luck.