Hi Joel - welcome back to the forum!
Certainly weight matters an awful lot when you are hiking, so it's hard to resist going with the lightest possible kit. My only suggestion would be to go with whatever body gives you the chance to use filters. A polarizer will be super useful, and so would an ND filter and grad filter I'm sure. But if it's at all possible, just bring everything (including the 70-200) and find a way to leave the heavy stuff behind somewhere when you do the big hikes.