I'm going to add in here some more information about California laws pertaining to pulling a 5th wheel over 10,000 lbs and under 15,000 lbs:
Page 11 of the California Motor Vehicle "Recreational Vehicles and Trailers Handbook" states:
A driver must have a fifth-wheel recreational trailer endorsement added to his/her Class C driver license to pull a fifth-wheel recreational trailer over 10,000 lbs., but not over 15,000 lbs. GVWR, which is not used for hire. This endorsement is not required if the driver has a Class A or Noncommercial Class A driver license.
• There is no fee unless your license expires within six months.
• You will take a law test for a noncommercial Class A license based
on the information contained in this booklet. You must also pass the
Class C law test unless you qualified for a Class C license within the
past twelve months.
• You are not required to submit a Health Questionnaire.
• You are not required to take a driving test to add a Recreational
Trailer endorsement to your current license.
• No other tests are required.
Lots (but certainly not all) of the Montanas fit in this range and most folks won't need to have a Non-Commercial Class A license.
Our 3295RK GVWR comes in at about 14,300 so we only need the
"fifth wheel recreational trailer" endorsement on our California licenses. When we upgrade our Montana, we'll be trying to keep the new one under 15,000 lbs GVWR.
Here's a link to the entire California Booklet of "Recreational Vehicles and Trailers Handbook" if someone wants to see it: