The British rock band Marillion has a song called Fugazi, which is also the title of the album. This is one of their lines: Do you realise, this world is totally fugazi. By context I can deduce...
Gross Vehicle Weight Rating (GVWR): is the maximum permissible weight of the vehicle or trailer when fully loaded for travel. This includes the unloaded vehicle weight, all fluids, cargo, optional equipment and accessories.
If your RV is composed of more than one unit (towing a trailer or a vehicle), then the GCW is the total weight of all connected vehicles and everything in them. Again, the only way to accurately determine the GCW is to drive the entire assembly on a scale.