Power stations and van solar systems

Hi Everyone, Im about to purchase a van and start my build. I will have 4 months to build and then move in full time. I am planning to have a propex gas heater, electric water kettle, some kind of ac, a Iceco fridge, laptop, and a portable piano keyboard (Im a touring musician).

My question: How many people have a built in battery and solar system and a power station? Is that over kill… Some recent builders are suggestion just to buy a power station for all your needs…

Im thinking two systems would make sure I have plenty of power.