I have done lots of road trips, this summer I did 2, 1 in May and 1 in Sept. I thought I would want music for long journies, however too many issues when riding can create a problem. Road conditions, large trucks, emergency vehicles ... And most of all I prefer to hear my engine, what gear I am in ... it's alot different than rollin on a Gold Wing or Road King.
So for me I like the sites sounds and smells of the open back roads.
Bar risers, adjustable rear sets, A emergency tire kit with CO2's would be good. Duct tape, leatherman type tool, AAA card, Radar detector, camera for sure.
check out
www.pashnit.com for some great suggestions too.