I just own a camper van. In current state of affairs, heat is a solved problem with diesel. Air conditioning still does not have a viable solution, aside from shore power. You can't practically use electric for heating or anything really beyond powering the lights and the heater fan.
Most vans max out around 3kWth. I have seen people use a used Tesla battery, but only have seen one report.
Most vans max out around 3kWth. I have seen people use a used Tesla battery, but only have seen one report.