I have a set of panniers that I use on my Lammy,
I tried to set them up for the GTS and they just looked wrong!
They stick out far to much and sit at a weird angle because of the side bubbles.
Your better off using "A big red bag" on the rear rack with tent on top and a 35lt Dry Sack between your legs attached to the shopping bag hook! I can pack a blow up double mattress, x2 sleeping bags and 2 coats into a 35lt drysack!!!
That is exactly what I use for all rallies and I ride 2 up with the missus and all her shit! The pet carrier can be used for shoes, vodka, tools etc.
If you ride solo most of the time it would be worth fitting Motrax Hooks to your seat as well so you can use the pillion part for another dry bag if you need more gear! See this thread
viewtopic.php?f=19&t=14ps.........panniers & top boxes leak, dry bags don't!