>>782642I don't know where you live, but almost every rest stop directly off the interstate where I've been comes with pic related. And the cops (usually state patrol) drive through the area and will approach people's vehicles and ask them to leave. I was bothered taking a daytime nap once. I'd rather avoid that hassle or potential hassle. Rest stops would be perfect places to chill overnight, but reality is, they do a lot to prevent it in my region.
OP, I also sleep in hotel parking lots.
>>784849I've considered blackout/reflective for when I sleep in urban areas, but I've never hassled with it. I think for the windshield it would be great, and they already make a lot of those products. I park away from others and relax under a sheet (even when it's hot). Never felt like I wanted more privacy, but I also wasn't living (just camping). It will get hotter than you think in your car, and if you go blackout/reflective, you won't be able to roll down the window and get air. And if you leave it up all day, that's just making a giant, "ALL MY WORLDLY GOODS ARE IN THIS CAR" sign and hoping people (or cops) don't fuck with it. And it will still get hot anyways. Cars just get hot. That's why I suggested the black mesh to keep out bugs and lets you get some air. There's a lot more of an angle to the inner doors/windows than I thought (couldn't hang something straight down for example), and I've considered suction cups, rigid wires/lines, and something like a rain fly on a tent and placing the attaching points in the car with some removable wall hooks. But I also fog up my car like crazy from body heat by the morning, and nothing but steady air flow keeps it cool. Anyways, I guess if you do blackout, it would be more for privacy or sleeping during the day, because it won't do enough to keep your car cool and it will prevent window/air access. Not sure how some of those van dwellers solved these issues (air, humidity, accumulating heat), so they might have good advice.