[toni-a]

I am not yet decided about my hiking kit.

Tried 5D plus 24-105, not bad at all however rather short on the tele end 

Tried 750D plus 17-55/18-55 plus 70-300, nice but will need to swap lenses and heavy

I am considering a single lens solution, Tokina 24-200 on 5D seems a viable option especially it has a legendary build quality, my other option is 18-135 on750D, here I have IS and much better resolution and much lighter combo, although the tokina will always have the edge when it comes to build quality and tolerance to hiking harsh conditions 

[Rover]

The 18-135 STM is a great lens. I bought one for my wife after I gave her my 650D. The lens is pretty sharp and the focus is the most quiet and instaneous that I've ever seen in a lens. The lens even worked decently on a 1D body (in a pinch or through an extension tube).