Thanks everyone for you input, my better half and I have traveled extensively on the GT all over the western states and Canada have over 100K two up together on various bikes. BMW tankbag is well worn and stuffed with God knows what.
"Has she done this before? If not I'd suggest she really won;t need all that she has packed and should lessen the amount in the top case to store the rain gear".
You tell her!
"I don't have any suggestions for storage, but I am highly envious of the 18 day trip. My dream is to take a few weeks and see the country on my GT".
Have a safe trip.
Thanks for the good wishes, high point of my year.
"You could always just get the wife her own bike".
I will set up a Pay Pal account for donations
"With the suggestion of adding a rack be careful of your Center of Gravity. The GT is already top heavy and two up with a full load (side and top cases full) that is a lot of weight high up not only for riding but also when parked (side stand)".
I have seen previous threads on the rack installation and came to same conclusion that the CoG would be adversely affected. I think I will try small compression bags from Aerostich and strap them to the grab handles. We did a dry run in the garage and it might work. if not $50.00 down the drain.
Mark in Chico