This is Lewis from Electrical Connection...we build the wiring and electronics for Bushtec.
The 2014 bikes are now all CanBus. They have combined turn signal and brake lights directly from the BCM (body control module). In order to have separate functions, we designed and are building a device that looks at the state the bike's lights are in and creates separate outputs for brake, left turn, right turn, and run. But in such a way it does not cause a CanBus fault.
If your trailer is a 4 wire, all you need is the new sub-harness and the isolator. If your trailer is a 5 wire, you need the new CanBus module.
The pinouts on the 6 pin Molex plug are different on the 2014 bikes. We have a new harness as well.
If you have any questions, or need some clarification, drop me a line. Happy to answer a question.