I'd call the BlackBall Lines and ask them.
I haven't ridden the ferry regularly in years (I used to ride it weekly), back then the answer on Port Angles was nothing overnight. They did allow parking (no slides) at Victoria, but not PA
There is an RV park very nearby (Peabody Creek)
2008 F350SD V10 with an 2012 Arctic Fox 29-5E
When someone tells you to buy the same rig they own, listen, they might be right. When they tell you to buy a different rig then they own, really pay attention, they probably know something you don't.