I took a new item with me on the road (mountains trip) recently. A simple thing, but one which helps a lot during the day to recharge things like iPhone, bike tail-light, compact cameras.
The NewerTech USB car / auto dual-port charger lets me charge two items at once, with up to 3.1 amps of power. At about $9.75, it’s a no-brainer. There is also a single-port unit, but it makes a lot more sense for two ports. Get two or three of them—that way the rest of the family can plug their stuff in and/or another one can be running in the trunk or back seat *.
The colored Lightning cables (for iPhone/iPad) are handy too—no arguments over whose cable is whose and longer and shorter ones allow a cable to be routed and device charged from just about any charger port in the car / vehicle.
* While the vehicle is running, most vehicles won’t tolerate pulling 5-10 amps for very long while the vehicle is off, but amps is generally fine for a reasonable period of time. But maybe Tesla owners and similar can pull more power than in regular cars (I don’t own an electric vehicle).