I agree, and with little effort, you could manually attach ‘cord’ with 240 plug to the high-power appliances like heat pump, hot water heater, AC, Oven, etc…then plug them into the truck when needed. You won’t be able to use them all at once, but you wouldn’t need to anyway in a real power loss situation. Just read the info plate for power use of each device and use less than total 9600 Watts plugged into the truck at once. Make sure the wire and plug are rated for the amps the particular appliance draws.