I'd add the recommend amount of Sta-Bil
to your gas tank, which I know you will have brim full so you don't get condensation. After the StaBil is added, run your generator at least 45 minutes to get it into the gen set carburetor.
You still must run your gen set every 30 days.
Unless the oil has less than a few hours on it, you should change it.
Top your batteries with water.
Then disconnect the positive lead to all your batteries.
Make sure your fridge & freezer is open.
Completely drain your water tanks. After you drain them, put in about 5 gal. of water with 1/2 cup of bleach and pump this solution through all your water lines, including your hot water system. As you in a hot area, that is a prime environment to go fungus and bacteria.
Make sure both your holding tanks have treatment in them.
I can't think of anything else.