Since the fridge is going to need two days (or more) to cool down, leave the fridge plugged in. I like my fridge cold enough to freeze milk and make eggs burst (I don't drink milk and I use powdered eggs, but I like a cold fridge).
Regarding the air conditioner, I notice the OP is from Louisiana, so maybe someone from that climate can chime in on whether to pre-cool the RV. I have a sister who has a snowbird home in Phoenix, and when she leaves in April she turns the a/c to 80 degrees and pays to run it all summer, cooling an empty house. Go figure.