Antigravity XP-20 Micro-Start Jump Starter

Antigravity’s XP-20 puts serious starting power into a pack small enough to live in the truck full-time. The current unit is rated at 800A starting current, 4,000A peak and 20,000 mAh, with enough claimed starting capacity for diesels up to 8L and gas engines up to 10L. USB-C PD also makes it a legitimate backup power bank.

This is the sort of gear that quietly increases how far from help you are comfortable traveling. Check the charge before a trip and top it up every few months in storage. When the key clicks once on a cold morning, the best jump starter is the one already behind the seat.