Congratulations on your new coach.
Indoor storage with power, even 15 or 20 would be great , you just have to make sure the power plug isn't controlled by a GFCI , that may trip and leave the coach systems running the batteries down.
If the fresh tank is full of residential treated water , and you'll be using the coach every few weeks , I wouldn't bother draining that tank . Black tank drained and flushed , grey tank drained.
Depending on access to storage , leaving fridge running is optional , but if you plan on getting the coach back to your house 24 hours before you head out , then turn it off in storage and start it when you're parked at home loading up for travel.
I'm thinking with removing the food , that should cover it . The only thing better would be indoor storage with power IN your back yard.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.