Buckshot I think your over thinking it. Don't know why the heck you want to be there at 0400 but opening day of gun your more important issue would be to get an area and if possible pickup your pass on Friday so you don't have to deal with it Saturday am. Those who didn't get passes will probably be lining up by 0400. I wouldn't sweat cars parked at obvious entry spots either. Some areas have a limited number of good access points and multiple cars will park there. If you're not the first to the spot you wanted you'll get waved off. Just be courteous and find another spot. I've run into a lot of guys that have been hunting Quantico for years and have even had a couple point me to a decent spot when going to a new area. Get an area, get there early, be polite and have a good time.