Instead of trying to do stealth, why not think about all the various places you CAN stay overnight.
Check out the viability of multiple Walmarts, Flying J's, Cracker Barrels etc. Just randomly rotate the locations so you're not always at XX on Mondays. Even if you have to drive, say a 1/2 hour to get to one, it's IMO, worth the gas to know that you're allowed to be there.
I'd randomly rotate between them, but I've seen one W/M where one couple stayed the whole dang summer, just moved from one side of the lot to the other for shade during the daytime. I'm surprised no one said anything to them but 'not my job'!
Use the drivers' app at Allstays.com to verify the W/Ms in your neighborhood and then check out any truck stops, Cracker Barrels in person. I suggest checking them out in person because I've found a couple of Flying J/Pilots that I didn't want to park in overnight and a couple of Cracker Barrels (really rare) that were posted 'no overnight'.
Also, any 24 hour gyms in your area, while requiring a little more stealth than the W/M, won't need total stealth cause people are there 24/7.