I meant its limitation when it comes to being rapidly charged anywhere. It takes a long time even on AC. Some of the newer portable units have remedied that. I believe the Goal Zero 500X has a 120 Watt charger option.Again, I don't think that's a limitation that Jackery can address because the "choke point" is likely the 12v power socket. Doesn't matter how good they make the Jackery if you can't push more than 10A through that socket.
For in vehicle operations, I would suggest just using solar charging. They way I envision my setup is that my solar panels would charge the starter battery when stationary and charge the portable lithium unit when on the go. Since my portable unit will be for light usage around camp and only as a backup for running the fridge, replenishment via solar need not be from complete empty to completely full.