I've been at this for a few days, and while I have certainly climbed the learning curve, I'm not competent on this.
I have an RB750up. A discontinued model, but still very useful with current manufacturer FW and OS. I want the 4 PoE ports to run 3 nodes at a site. I have setup a few of these, but just as a basic bridge with no vlan anything. But I have a new case where I need WAN to get through.