Let's back up for a moment. CA requires a NON-COMMERCIAL CLASS "A" license for 5ers over 15,000 Gross Vehicle Weight; an endorsement on a class "C" for 5ers 10-15,000. Also to take into consideration is that by definition, any vehicle or combination of vehicles OVER 26k requires at least a class "B" license. California does go on total weight of vehicles and tows, AND if you are licensed for "triples" in your home state, you ARE NOT legal in CA.
It is always smart to weigh your rig fully loaded with everything including passengers and fuel/water/sewage so you know you are legal wherever you go.
