Welcome to the forum and congrats on your new 18 Equinox 2.0 LT. I'm fairly new here, myself.
The only noise(s) I've experienced was the fuse box cover at the rear left near the hatch. I placed electrical tape over all 4 tabs and I haven't heard a peep from back there.
I've had absolutely no rattles (or leaks) from the sunroof or any other issues, thus far.
Please keep us posted on anything that develops, you remedy or the dealer resolves on your new LT.
2018 1.5L Equinox AWD Premier
Sun, Sound & Nav. Pkg.
2008 3.6L Saturn AURA XR