I want to get dual bateries to run a accesories-fridge, water pump, whatever-It may be stupid but I was thinking that the easiest thing might be to have the second battery in my drawer system and run a simple 110 charger and inverter to it off my main battery when the car is running to keep it going. Wondered if there would be a problem with this electrically, and if it would work for what reasons would I want to go the other route. Also I don't have a winch and don't plan on one.