The best car camping power setup is usually the one that matches your real daily routine, not the one with the biggest advertised capacity. Lights, fridge use, charging habits and work devices all shape the answer.
For short trips, a compact power station with a realistic daily budget often beats a larger but poorly matched setup. For longer trips, recharging strategy starts to matter more than absolute stored energy.
A good setup balances simplicity, runtime and how often you can top back up from driving, shore power or solar.