That is great idea, the challenge is that every vehicle type would require a different harness for that car which could become confusing. Typically customers prefer our universal solutions such as FM Transmitters, Cassette Adapters, or direct connect cables. Keep an eye our for a new direct connect cable, our Monster Performance Car iTV Link for Car which will be available in October and will charge the iPod battery and output Audio & Video through the 30-pin dock connector of the iPod to a composite Right & Left Audio as well as Video RCA style connector for easy hook-up to an after-market Car Stereo.