Minimal is fine until the night you are half a mile past an exit with a dead battery and rain rolling sideways. A small lithium jump pack is the thing that turns a ruined evening into ten minutes and a sigh. A headlamp makes every roadside task safer because both hands are free and drivers can actually see you. A plug kit plus a glove box compressor turns a nail in the tread into a slow exhale instead of a tow. Toss in work gloves, a cheap poncho, and a thin blanket so you do not shiver while waiting.
The unglamorous part is maintenance. Charge the jump pack on the first weekend of each quarter and test the inflator for a few seconds. Swap snacks and a bottle of water on the same schedule. Keep a printed insurance card, a pen, and some small bills because phones die and card readers fail. You will never anticipate everything. Cover power, visibility, tires, and warmth and you have most of the bad day handled.