If you're leaving it "for years" I would suggest emptying the gas tank completely. BTW gas or diesel?
Diesel will probably be okay then full. The new fuels are more additive and chemicals than fuel. Put oil straight into the injector ports or pull the plugs and pour oil into the cylinders that way.
This is for a year or more. It's the extreme storage of a motor. I stored a 351 for several years, and it started immediately after new plugs, gas, and battery.
Remove batteries. Get a good maintenance charger.
If you're worried about your tires, then jack stands under the axles, to keep the tires from flat spotting. Then let the air out of your tires.
Leave the windows down just a touch to allow airflow. Or just keep the doors cracked. If you live in a humid place, put a tub of floor dry or one of those 'air dry' things you get at Home hardware to keep the interior air dry.
I leave my trucks for months at a time. The longest I leave them is 6 months, but I've always just connected the battery, pumped the throttle, and they start right up.
Wombat - damn, and I don't get home for 3 more weeks!