Hi Happyheart,
I practice this for indoor storage. I would suggest the same for your RV port.
Full gas tank for sure. I would use a stabilizer only if storing the rig for significantly more than one calendar year. I don't feel the generator requires special care though other replies say otherwise.
I recommend to disconnect all batteries and charge them once every 4 months using a secondary charger.
Do NOT have active electricity operating through your rig's wiring during your storage period. Not 110V, not 12V. Keep everything shut down dead. You never know what can happen. RVs do catch fire once in a great while from a failed electrical appliance or function, or even rodent damage. Why take that risk unnecessarily?
Being in humid Texas, buy a large room dehumidifier and power it through an external 14 gauge power cord directly from your main house. Do NOT power it through the RV wiring. Setup the dehumidifier with a constant drain to the outside, set it so it feels comfortably dry inside, ideally at a setting that has the unit cycle on/off.
I would put 75 PSI in all the tires and park them on a hard surface. If parking on gravel or dirt, get 4 large 2x2 foot patio blocks and set the tires on them. You want water to drain off the blocks to avoid having the tires sitting in water.
Cover the tires from direct sunlight.
Do NOT extend your leveling jacks for so long of a period. A rusty film forming on the tubes will create retraction issues.