What's the plan? Oregon is not Arizona as you may have noticed when it comes to cloudy skies. :) How long do you need to go off-grid before being able to plug in somewhere?
Will an extra battery get you to the next plug in time or not?
Generally, you should always have a gen ready to go to cover for cloudy days with solar. An extra battery would be good too, so you can go longer without having to drag out the gen.
At some point with little solar coming in (ie for the next six months) you will need the gen, no matter how many solar panels you have, if you intend to keep camping off- grid in the "darker months."