I successfully installed a brake controller in my 2014 24S.
First off, I was disappointed to find the Forest River put a 7 pin trailer plug on the hitch without providing all the proper wiring. After tracing all the wires from the hitch back, I found that the blue wire used for a trailer brakes goes all the way up to the compartment under the driver seat. While this is certainly helpful, it still does not provide for all the wires necessary to install a brake controller.
Still need brake switch wire, power and ground. While power and ground are easy to obtain in the same compartment as where the blue wire resides, the brake switch (red wire) is no where to be found.
From suggestion at Forest River, I tapped into the brake switch wire at the rear of the coach, which forced me to run 25 feet if wire. The brake light switch wire can be found once you locate the coach driving lights control board. Mine is located next to the shower pan and is accessed by removing a panel in the large outside storage area.
This could easily be provided by Forest River.