on the ozzie and africa trip, I had rear tanks with 13 litres of fuel on the right and 11 litres of water on the left. the exhaust was routed under the right tank and the tent slung under the left. the rear tank rack was mofo heavy but connected to the footrests and a long stud where the subframe is usually bolted to the frame. the steel min-sub-frame was also reinforced. all in all, the aluminium subframe was kind of bypassed and gave no grief despite having 12kg of luggage on the tail piece and another 7kg on a front rack.
on the middle east/asia trip, I had a 15-17kg kit bag on the back without having reinforced the rear subframe, but I rode like a jessie and stuck to tar (I'd cracked a vertebra in June and was chicken about hurting it again)
GTX is fine for the way most of us ride most of the time. I'd rather replace reasonable oil regularly than leave good stuff in forever
happy travels! may your oil checks be regular and your changes be free from shiney metallic bits
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