Unlike bias ply tires, flat spotting over an 8 month period with radials shouldn't really be a problem in either of California's Brentwoods, although wheels off the ground can't hurt. I like these things for my "summer car" so I can push it around the garage in the winter:
Unless someone is going to start and drive the car long enough for it to be fully warmed up, there is no point and some believe the practice is actually harmful to periodically start the engine just to let it idle.
I don't bother to disconnect the battery for seasonal storage, but perhaps I should. I always use a Battery Tender to keep the battery fully charged.
Do use a fuel stabilizer/winterizer.
Leave the hood up so that the engine bay does not become an attractive nesting area for critters, but put the rat poison and bait in some nearby place other than in or under your jeep. Why do you want to attract unwanted pests toward the very thing you want them to ignore?
Other than the above, I don't do anything special for the vehicles I own that sit idle in the garage two seasons each year.
When you return home just check the fluids, tire pressure and battery, fill the tank with fresh gasoline, and go jeeping.