Greetings and congrats. Take your time and enjoy the view.
As for that three legged plug. Your 'shoreline cord" may have to be plugged into it when running the generator. Not all RV's have automatic switches. I would be surprised to see a standard 110 volt plug on the shoreline cord unless the previous owner used an adaptor so they could plug in at home. DO NOT make the mistake of thinking this will plug into a Dryer outlet. Dryer outlets are 220 volt and will destroy many things in your RV. Do a search here on 30 and 50 amp shoreline cords and plugs. An inexpensive voltmeter can prevent a lot of misery. A quick check on the pedestal, turn the breakers off, and then plug the rv in to increase safety.
Read the manual, take notes, read the manual again, and then follow it. And of course come right back here for lots of free information.
The Redwoods in Calif in November and December can be perfect weather. When you get close check back for more details on routes and places to visit. We are native northern Kalifornians. Now transplanted to Florida.
Myron & Deborah
08 HR Endeavor 40 SKQ
2016 Ford F150 Limited V6 with Ready Brake
Aluminator tow bar, Demco base plate