In my travels this past summer (Glacier, Yellowstone, Colorado), the lens most used was a Tokina 11-16. I'd highly recommend an ultra-wide angle to complement your existing 'quiver'.
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On my bike tour in France last summer I took the 5DII, 17-40, 24-105 and 70-200 + 1.4. Fitted easily in the top box.Any photos on how you had it packed? Did you use a camera bag/case inside?
Since you are on a motorcycle, why not look at smaller cameras? There are a number of small mirrorless cameras on the market that would be a lot easier to take on a cycle.Not sure that what I've seen so far in that category really impresses too much-sensor size and IQ. Are there any ultra-wides available?