Or you get enough vehicles running 24/7 that you can get the customers to come get the package: "Free delivery if you can come pick your package from the van between 545am and 555am on the 24th" and then you can notify the customer as the van arrives. You make the van into a mobile Amazon Locker Hub or whatever those are called (we have one in my apartment complex). You can even schedule a half dozen deliveries at once for houses close together with a larger window: "Your Amazon Delivery Hub Van will be located 100 yards from your home to the west, at 123 Main St. from 5PM until 6PM tomorrow, please enter 123456 to get your package."