After comparing several places, I chose
https://thecliffsmarina.com/boat-storage/ — and I have not regretted it at all. They are located in the southeast of Possum Kingdom Lake, just conveniently accessible from Fort Worth. They have covered docks of different sizes (from 11x24 to 18x50), you can choose one for a specific boat. Plus, there are hydroports for jet skis and temporary docks. There is a gas station and a store nearby - everything is very convenient. What is especially pleasing is that the staff really helps, they tell you where it is better to go fishing, where it is quieter, and they are always in touch. Their service is at the VIP level, as they say. Contact them, tell them what you want - they will definitely help!