I'd like to add a couple other ideas about stealthy parking.
When I put in my fancy-pants Kenwood head unit, I saved the factory radio and made a fake faceplate and set it up to velcro over the Kenwood when we park. Someone on the forum did a tutorial about it few years ago, which is where I got the idea. I'd post photos of mine if anyone is interested.
When these guys talk about keeping valuables out of sight so that a would-be thief can't estimate what else is in the van, I agree and go all the way.
For ex, my doghouse has slots for coins on one edge. I never
keep coins in it, because these lowlifes might be tempted to break your $100 door glass to grab that $1 worth of change. Likewise, when I smoked, I wouldn't keep a pack of cigarettes in view from the outside, either. Nicotine withdrawal can be a powerful motivator. (Guess how I know.) It's amazing that small stuff like this can make a criminal do a smash-n-grab, but apparently it does.
Don't put stickers on the van that advertise what you may have in the van, like stereo, firearm or even Apple logos.
I take my money clip and credit cards with me, and my wife takes her pocketbook (her purse stays in the van, hidden away) when we leave the van, even when there no ATMs or things to buy on the trail. We also take our iPhones. My philosophy is that they can't steal what isn't there. Replacing your DL and CC's is a pain, and since the cards and cash are small and light, they aren't a pain to carry even on long hikes.
On the morbid side, since we often hike before dawn and after sunset a lot in very lonely places, we are at risk of falling in the dark. Having our DL's and insurance cards would enable rescue teams to identify us and access our health records if needed. We use the Health app in iOS for basic medical info for them if they find the phone. Plus the phones have rudimentary GPS, compass and a flashlight, which backs up our better units.
I'm kind of on the fence about putting Reflectix or sun shades in the windows because it's a signal that you are going to be away from the van for some large amount of time, but they do keep prying eyes out. When I can, I prefer to park the van so that the front of the van is facing away from the sun, and drop the curtains that are behind the tinted windows in the back to keep the heat out, plus they can't see through the curtains. Curtains down behind tinted windows is less noticeable than shiny Reflectix.
I also have a couple Bulldog boxes
in crevices in the back. They aren't really safes, and can be pried open with the stuff I have in my toolbag that I leave in the van, but they are lockable, black, small, and easily hidden under the all the other junk I have in my storage areas. If a thief didn't know they were there, they wouldn't notice them easily.