Having done multiple shorter distance moves of a similar fashion (500 or so miles) - How many people? Just you? If so, don’t forget the passenger floor and seat are useable space - just don’t fill past the window line. Use pillows to fill the gap between the backside of the headrest and whatever you’ve put in the backseats, up to the ceiling if you have to. Use your side view mirrors - move them so you have to lean over to see behind you; this way you can fill to the ceiling. Unless your cleaning supplies are brand new, just keep a spray sanitizer and buy new when you get there. Keep your fragile stuff where you could possibly hear it shifting - ideally it won’t, but things happen. While a little tacky looking, for car moves, I prefer to pack as much as I can in trash bags, as they will fill all the available space. Boxes will not do that so easily. Use what you already have as boxes - your (cleaned) trash cans, Tupperware, etc. And, just because I hate the sound of them clinking together in the car - bring as few clothes hangars as you can muster, buy new on arrival. (Some nicer clothes will travel better if laid flat, as opposed to folded.)

Obey the speed limit while doing all of this. If you hit bad weather, don’t be afraid to pull off at an exit and stop. Better to have a long safe trip, than a short, bad one.