Yeah, everyone we met down there, who were doing your route, took the train to Portland and rode south.

Resources:
Bicycling the Pacific Coast
Kreb's maps
Adventure Cycling maps

All the tourers we met were running triples.

I've attached our list from our recent tandem tour. So divide this stuff by two and then subtract some more. You should be able to get it down below 20 lbs., including bike spares, tool, rack, bags, etc. Then maybe you can ride the hills rather than walk, if you have clipless and MTB shoes with soles that will do well on asphalt, so you can still walk when you have to. I'm old and 160 and can climb 10% in a 67" gear on my beater road bike, with 6% being pretty comfortable. Lower than that would be better. Our tandem climbs the steep stuff very nicely in a 21" gear. So it's all about getting the weight down.