Yes, combined with a module like the Curt 56040 that adapts the Subaru 8-pole trailer connector to a 4-pin flat connector, you can add a "4 flat to 7 round trailer adapter" and splice the extra wires for reverse (yellow) and 12+ Aux (black) directly to pins 3 and 1 as shown above. In addition, one wire (blue) will need to be ran back separately to wherever the brake controller unit is mounted, unfortunately Subaru didn't pre-wire for that even with their guidance for towing over 1000 lbsSo Subaru suggests adding a brake controller for a trailer over 1000 lbs. If I do won't I need more than a 4 pin connector? Can I add that 3rd party?