The other side of this coin is what about a trailer with a CCC of 1200#? It's not like the door locks closed and you can't put anything else inside once you reach the max #.
When shopping for my last RV I was really surprised how low some of the capacities were. Some are barely over 1000# and a full load of water ate up half of that.
Also, I've often wondered if the CCC is just for while you are rolling? I almost think is has to be. Otherwise, the 10 people the trailer is advertised to sleep better weigh under 80# each :)