Ture !!
Very tough to manage trek + photography with multiple lenses but results are so rewarding 
For me toughest thing during trek is DSLR hanging around my neck which has weight of around 1.3-1.5 kg all the time. It is easy to move around for an hour or so but in full day treks, this 1.5 kg weight becomes tough to manage but now i am used to it 
yaar mai ne aik cheez note ki hai keh tour ke beech mei agar koi location ya scenery drop kar do keh wapsi par kar lein gey to woh kabhi nahi hoti .... hamesha wapsi par miss ho jata hai 
So, now i have made a thumb rule keh jo opportunity miley us ko avail karo !!