I've had mixed luck with jump starters, but a decent tire inflator is worth it's weight in gold. Particularly if you have run-flat tires instead of a spare tire or large volume truck/SUV tires. I carry a Viair 70P with a battery adaptor, and it's head and shoulders above my Wife's Campbell Hausfeld.

For nocturnal repairs, I've yet to find anything better then a headlamp loaded with lithium primaries, and a hi-vis vest