Lancey...your paste and copy doesn't come from any BC size and weight codes but rather a info sheet. Read on down to the bottom where its says quote:
***Information on this Info sheet is subject to change without notice. In the event of conflict with this Info Sheet and the Motor Vehicle Act and Regulations, the Acts and Regulations shall apply.***
Now when we look at BC's MVAR "weighing of vehicles" code it says in part ; (paste and copy as its long)
** The gross weight of any vehicle or combination of vehicles shall be the sum of the individual gross axle weights of all the axles of the vehicle or combination of vehicles. **