Thanks guys. I have seen the owners manual and it's not much help other than operation of the head unit. I could have used the install manual, but i think i've got that much figured out now. I also know how to operate the fader and balance control.
It appears i have a problem with the LF channel. It quieter than the RF on AUX, TUNER, and CD. I've swapped speakers from left to right, and confirmed polarity of the wiring.
I still however cannot get the TV to play thru the AUX input as suggested. There is no signal from the TV for the RCA line out.
I'll have to find a manual for the Sansui TV, but i the model # is behind the wall mount bracket, so that's making that difficult.
I was hoping someone else with the same trailer and equipment could tell me how theirs operates.