I know you say you cannot leave, but the best advice is to load up and leave. No hurricane, is good. Storm surge can be bad and even if you are spared wind and flood damage, the after effects of the storm can last for days and weeks. Areas can be with out power and other services for days. Food and other supplies can be in short supply.
I am sure someone will tell you to fill your water tanks or keep the RV pointed into the wind. Honestly, the small amount of weight in the tanks will have very little effect on the RV rolling over. As for the wind, as the storm passes, the wind will shift drastically. Are you willing to go out in the storm and move the RV to keep it pointed into the wind?
Having lived in the Houston, TX area, I have experienced several storms and I would head inland to get as far from the coast as possible and do not park near any trees.
Since you are set on staying, fill your water tanks, fill your fuel tanks and stock up with groceries and batteries if it is not too late. Otherwise, we wish you the best of luck.
Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer