When I took delivery of my 2015 Tracer Air 250, I immediately discovered some problems with the Jensen Media Centre wiring. (1) Some of the 6 speakers were wired out-of-phase and (2) only one exterior speaker was operating.
Being a retired recording engineer, I pulled the Jensen out of it's compartment and looked at the back of the system. One of the external speakers was not hooked up at all (The naked wiring pair hanging loose behind the unit not connected to the speaker). The other external speaker was hooked to the wrong channel. Two of the four internal speakers were wired out-of-phase and reversed L/R. It took about ten minutes to re-route and correct the phase of all the offending speakers using phase and continuity checkers and now it sound pretty good. I think this is a little sloppy of the manufacturer "Prime Time". I've also found that the interior and exterior light switches were wired in reverse. I'll fix that later as the switches do work just not the way they should. Hopefully this isn't the norm for all their trailers. It was probably rushed through on a Friday so the wiring tech. could go fishing for the weekend.
I had the unit out for it's first official camping trip last weekend and all went well. I've already converted all the internal lights to LED to save on power consumption (Thanks H4).
My dealer did offer to fix the speaker problem but I decided to solve it myself since I feel I have more expertise in audio wiring than they probably do.