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I enjoy frame and saddlebags when not carrying camping stuff, but spare clothes etc. But you could save ~1kg by using drybags (300g vs 1400g) instead of panniers but still enjoy low center of gravity and the benefits of lowriders.
I fit my sleeping bag, mat, bivy + tarp in one of these drybags. Then clothes + food/snacks in the other. Lightweight lowrider alternative to bikepacking bags.
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I concur with your idea of a compressor on both side of the fork, the main advantage is that you needn't worry about the carbon fork taking the weight of the low rider and panniers which add up tremendously before you even pack it.
Find out if it's possible to get Trek's own mount as I don't trust Salsa nowadays with their limitless recall special.
Did Gorilla make some large bottle cages too?
Big framebag and saddle bag would sufficient while keeping your bike feeling very lively,