If I understand your question correctly, you have three modes, parked, transit and operation.
Parked is at your house and you have house power available.
Transit is when you do not have power available.
Operation is when you are powered with the generator.
You require powering only the fridge and freezer with the battery during transit. You are not operating the kettle or blender with battery power. You can recharge the battery during Parked and Operation.
How many hours a day are you in Transit mode?
How many hours a day are you in Operation mode?
2011 Ford F-150 EcoBoost SuperCab Max Tow, 2084# Payload, 11,300# Tow,
Timbrens
2013 KZ Durango 2857