The ccc is based on full fuel, fresh water, and propane, and nothing else.
If you and the missus weigh 350 together, that leaves less than 600 ponds before you have even loaded a dish or a pan or a towel...
Running with the water near empty might give you another 500 pounds...
Best bet is going to be to weigh the coach, and see where reality really is, and go from there. You wouldn't be the first RVer to run overloaded, nor the last