I also change out the radio in our unit. The unit came with a Kenwood KDC-152, The main reason I changed it was it would not pick up AM station very well.
The new radio a JVC KD-x250 BT has Bluetooth. I could take bluetooth head phone out of the trailer and not bother my neighbors. It also has a USB input that can be used for charging or input. The big knock would be the control are not very intuitive.
Now the part I could not believe is the hole and the wiring connector fit with the new radio, that's a first.