I don't know about the headlights or steering wheel on your 2000, but maybe I can help on some of the other stuff.
The headphone jacks, speaker and volume control over the bed on our coach is for the TV.
We have never checked on a dishwasher, I wouldn't want to add the weight.
One of the first thing we did was replace the stove-top with a range with a full oven. You loose some storage drawers under the stove-top but you got to have an oven! We bought an Atwood http://www.atwoodmobile.com/images/A...esentation.pdf
Good luck, enjoy and keep us posted.