As far as I no trane doesn't make indoor equipment for mobile homes, the installer would have to match with an approved 3rd party air handler like a mortex or maybe Aspen makes one.

I agree it would be better to convert over to a package heat pump.

To the op, sorry we apparently aren't telling what you want to hear...I'm not understanding your hesitance to take the advice given seeings how you took the time to become a member here. I am curious what answer you prefer to hear?