I've seen this mentioned in some of the pages i've searched through. However all the examples seem to only have one load attached to the last relay in the pair. I want to run separate loads off each relay but still maintain exclusivity between them. I haven't been able to find a schematic that demonstrates that yet so i'm having a hard to envisioning it. Is that were the DPDT comes in one set for the relay to relay and the other set for the load?
Exactly, one set of contacts for each relay form an interlocking arrangement such that only one relay can be energized at a time. And of course the other set of contacts on each relay is free to perform whatever the purpose of the relays are.
It's very simple actually. Say you are working with 12vdc relay coils, wire +12vdc to the common contact of both relays, then run a wire from relay #1 normally closed contact to one of the coil terminals of relay #2, and also a wire from normally closed contact of relay #2 to a coil terminal of relay #1. The other coil terminal of each relay wires it's driver transistor collector or drain which pull to ground to enable the relay coil.
So draw that out and see if it's not both a simple but elegant solution of mutual exclusive operation of the two relays.