Here are two pertinent pages extracted from the diagram set I've built for my 2008 HR (2007 F-53 chassis).
One page shows the wires to the under-dash connector. The second shows the wires to the two connectors you found at the rear.
On my coach, Monaco elected not to use the wires Ford provided for electronic brake control. With your coach, maybe Thor did use them. There's no way of knowing without some continuity testing between the dash and rear connectors.
If there is continuity, then the brake controller wire is on connector C405 (the larger, 12-pin connector), and on the pigtail that's plugged into that connector. Open the wire bundle aft of the connector, find the blue wire. Test for continuity with the blue wire on the under-dash connector. Using a heat-shrink butt connector, add a 12-gauge wire to the blue wire on the C405 pigtail. Extend the wire to the correct pin on the 7-pin connector (see this link
). Terminate the wire there. Done.
If you want, do the same thing for pin 7 on C405 (trailer backup lamp), and you'll have a backup signal should you ever have a trailer that needs one.
The battery charge pin is a whole 'nother kettle of fish. You'll notice Ford does not provide on on either C405 or C406. In fact, they don't provide one on the F-53 at all. They leave that to the coach builder. Interestingly, Ford does provide a charge line on the 7-pin connector for the E-series van chassis used to build Class C coaches.