Most if not all the toll roads in CA use Fastrak transponder which is not part of CalTrans, it a private company. If you want to use them for your MH and towing your toad, some are posted no towing allowed. The ones that do allow towing charge by the axle for anything other two axle car. At least in the LA area, not sure about San Francisco area. If your MH has a tag you can't drive in the toll lane on most freeways in CA.
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129