I went with the Mark T Packs and Stacks with bones and silencers on my Valk. I loved the sound with the packs and stacks, on night when I went to bike nights, I put in the bones for the noisy bunch. When the wife was along, she liked it quiet, so I ran with the silencers, still sounded good from the glasspacks but quiet for her. It was the best of all worlds. I wish someone would make packs and stacks for the GW style bikes.
Please post your findings after your trip. Sounds like a great trip is planned, enjoy.
Marty