The CD PLAYER that is vertical did not survive very long in my 5th wheel trailer. It was the first thing to fail.
I have a stand along WALMART CD player now to play music CD's that is plugged into the sound system aux inputs. I did the same thing with the movie DVD player. I just use a $20 WALMART DVD player and plug in the three video cable inputs to the HDTV video input connections. Works great for us.
My other POPUP trailer has the JENSEN CAR RADIO that has CD player built in and it is still working fine. This unit goes way back off the power grid forest roads and trails and probably gets banged around alot.
I don't have much faith in the those drop down LID type CD/DVD payers.
Roy Ken