Probably the budget cuts, though I don't see any news stories confirming it. I don't know staffing on the Squad/Heavy Rescue/cool tiller with a crane (whatever they are calling it now). I would guess more than 4 as it's a tiller and it's function. If you're looking for a snooze here's a link Portland Fire and Rescue Service Delivery and Staffing Study
I think they are using Engine 12 and calling it Squad 12? I saw the engine at a traffic accident. And they are dispatching it to fires, the regular Squad 12 has no water capabilities on it.
Looking at Portland Fire web site, Station 12 has Engine 12 and Squad 12, which is a tiller truck. They may have switched Engine 12 to squad 12. If the tiller truck is no longer at station 12, they likely relocated it to new station.