I can never find reliable coffee on the road, so (especially if I am camping) I press my own coffee with a coffee press and a backpacking stove. The Camelback and Thermarest are also great ideas. I usually also take a folding camp chair for rest areas where you want to sit by your car (hatch up, soobie style!).

Maybe you might want to put some books on tape on your Empeg, too.

Sounds like a rocking trip. Hope you have tons of fun!