Replacement ideas for pos Jensen a/v receiver

Plenty of car stereos have DVDs built in. It might take a bit of hunting around to find one that can be set to always play the DVD (without requiring multiple cycles on the "parking brake" wire). Many/most of the better ones have line-level audio outputs; adding an external amplifier or two will give you three zones without any trouble. You could incorporate some nice little switches in the bezel to remote turn on the external amplifier(s). (Most car stereos do kind of have two zones already, of course, the front and the back speakers.)