Kept my boats on a mooring in a boat yard for nearly 40 years. My current boat, 9 ton Nordic Tug 32+, was on a mooring for 12 years. I had the yard put in a 500 pound Dor-Mor, and the chain was examined every 3-4 years, and replaced when needed. Dual Yale Maxi-Moor 1" pendants running through 1" chocks held the boat strong. The boat rode out storms up to Cat 1 hurricanes without problems. I have a 130 watt, 16.5 volt, 8 amp solar panel, and generates enough to maintain the charge on house bank, and kept refrig running (on low), when we would leave the boat for days at a time.
In 2006, we have a big Fall low pressure system come through with 2 days of sustained high winds, gusts up to 60 knots. The boat in front of me, a 40 foot, 9 ton Hunter Legend broke free (no chaffing gear), and came down on my boat, impaling its bow anchor onto my transom. Boat yard staff came out and tied the sailboat on my 2 stern cleats, and the 2 boats rode out the rest of the storm. Damage to my boat was a hole at the bow under the anchor guards, scratches down the port hull, last window smashed in the salon, and a hole in the transom (from the sailboat's bow anchor)... mostly cosmetic, and repaired. As pictured, the mooring carried both boats.
Make sure your mooring and gear are strong, chocks and cleats properly sized, AND MAKE SURE YOUR NEIGHBORS ARE EQUALLY SECURED !