Terms- CCC applies to towables. The yellow sticker is OCCC "Occupant and Cargo Carrying Capacity" and applies to motorized vehicles. Full fuel, propane, coolant and engine oil are now included in basic weight of the vehicle. OCCC is what is left for people, (Dogs, cats ferrets etc) fresh and holding tank water, clothes, tools and adult beverage.
In your figures you may be adding fuel and propane that are already included.
Explanation here:
New RV weight labels - OCCC replaces CCC
Easy to load for travel and get the rig weighed. CAT scales are easy to find.