From my experience leaving salt on your bike for more than a good few hours can damage components which are anodised. It eats the anodised layer then reacts with the Al making it worse. So for long car journeys I put the bikes inside. I know this may not be possible so suggest rinse that salt off asap. May be cover the bikes?
I fitted an outdoor water pipe heater cord to my outdoor tap. It switches on at 3°C to stop it freezing. I appreciate does not get as cold as Alaska so this may not work well. I take the hose indoors.
WD40 is good imho, I use it, but get the salt off first 🙂
Edit: anodising is a protection layer and should be good most of the time. Just I experienced where it was worn thin or scratched then salt did its evil.