While some new vehicles are beginning to accompany USB attachments in the back, they’re still generally uncommon. In the event that yours doesn’t have them, or you need to promise you can keep the meddlers calm in your rental vehicle, investigate the Belkin Road Rockstar.
The Rockstar (as we’ll call it) has a couple of USB attachments for use by the driver and traveler, and a little box with another two attachments for those in the secondary lounge. A six-foot link runs between them, more than long enough for most vehicles, and the case can cut onto a seat pocket to keep it secure and far removed.
The front two ports divide 2.4 amps of force among them, while the back ports have 2.4 amps each. That is sufficient to charge three tablets or four telephones simultaneously, yet not generally at most extreme speed.