So if I were setting this GRE Tunnel on a router on Site A going to Site B, would the source be the IP address of the WAN interface of Router A, and the destination being the WAN interface IP of Router B?
The answer is that it can work correctly configured in different ways. In many cases the source and destination addresses are the WAN interfaces of the routers. But in the case where there might be two WAN interfaces it is prefereble to configure the source and destination addresses as loopback interfaces.
The GRE tunnel can work with source and destination address as WAN, as Loopback, or even as LAN. The only real requirement is that the tunnel destination address must be reachable without going through the tunnel to get to the destination.
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