https://www.amazon.com/dp/B07NZSDB5M?ref=ppx_pop_mob_ap_share

These and I cut up some of those fold up window reflectors to sit under them so I can crack the window and still have it be blacked out and private.

And Home Depot foam

https://www.homedepot.com/p/FUTURE-FOAM-3-in-Thick-Multi-Purpose-Foam-10030BULK3/203837114

My recommendation is to keep it simple. We are in eastern TN and have car camped some in the Smokies as well. These window screens are excellent for keeping airflow but not bugs in. We use a rear hatch tent as well that gives more leg room and keeps it breezier too.

If you are doing weekend trips, I've found you don't need any fancy charging situations. I usually bring a 10,000 mAh battery pack but don't really use it. We have car chargers and make sure to plug in devices while we drive them turn them off overnight. When we are out camping, being on our phones or any device is pretty low priority so we'll bring books and read instead.

For a sleeping pad, a foam mattresses is going to be the best. We have a full sized 3" foam mattress and it's almost as comfortable as our bed at home. But it's bulky, so that is also a factor too.

Keep it simple and go try it out and see what you need and what you don't use. Don't spend a whole bunch of money on stuff that looks cool, you'll end up with way too much.