Here is a pic of the install. I plan on replacing the 1/8" plywood I used as a backing plate with a 3/4" oak panel stained to match the cabinetry.
The two larger round black buttons below the radio are switches I installed to control the radios functions. The one on the left has a small red light when turned on. This controls the 12 volt feed to the radio. When turned on, the radio is powered up much the same as when you put your key in the ignition and turn the car on. Conversely, I can turn it off when I am away from the trailer so it not left powered up for an extended period of time. The button on the right has a small blue light on when turned on. This is connected to the wire that would normally tap into your park lights, which controls the nighttime dimming function. When your headlights turn on in the evening, the dash lights (including your radio) dim accordingly. Since the trailer doesn't have this capability, I added this switch on a separate power lead so I can dim the radio display in the evening if I have the trailer lights turned down.
All trailer sound systems have an indoor, outdoor and indoor+outdoor speaker setting. The Pioneer, being an auto system, has the standard front and rear fader control. I connected the inside speakers to the front speaker wires and the outdoor speakers to the rear speaker wires. Using the fader control I can adjust all the speakers however I wish.
It is also a more powerful system than the original Concertmate so I changed the inside speakers to match and the sound is much better. I plan on changing the outdoor speakers this summer. Did I mention that it also has a wireless remote that controls almost all functions? Hope this helps.
2010 Wildwood XLite 26BHXL