Section 35103 Of Chapter 2. Width From California Vehicle Code >> Division 15. >> Chapter 2.

. (a) A vehicle used for recreational purposes may exceed the maximum width established under Section 35100 if the excess width is attributable to an appurtenance, excluding a safety device, that does not exceed six inches beyond either sidewall of the vehicle.
  (b) For the purposes of subdivision (a), an appurtenance is an integral part of a vehicle and includes, but is not limited to, awnings, grab handles, lighting equipment, cameras, and vents. An appurtenance may not be used as a load carrying device.