Not much help on the paniers or the tank. As for the sprocket, some feel its great for the highway as it drops your rpms down when cruising. Personally I don't feel the need for it as my stock sprocket puts the rpms at 5 going 70. Don't really push the klr pass that. In all honesty, the only reason I chimed in was you said your klr has never been off road. Your really missing out on literally half of that bikes potential. Sure it's scary at first, but man, that's where the klr offers up. It's not great off road, nor on road, but you blend the two and that's where the klr really shines as a go anywhere, do anything. Do it justice and go off the pavement, slowly, and just explore the places that bike will take you. I promise you, it will make you smile.