I personally think even the 48 to 50 foot cats are two big for the poorly maintained 3/4" polypropylene line moorings. I don't use them if the wind is over 15 knots unless some capable of driving the boat remains onboard. The Voyage listed weights are a base boat. My voyage cat charter ready was 20% heavier then the quoted number when it was hauled. The Moorings boats are quoted commissioned and charter ready.
The size limit however is for spacing on the balls. There are several area's like the dogs and Monkey point where the 60 simply dominates the moorings. I suppose everyone can decide which rules they feel are applicable and which are not. The nice thing about the 60 is that you can anchor out and use the large dinghy to hit these places quickly and easily.