I'd consider a Wehman as well. Haven't beaten mine up yet. but I am confident it will take a lot of abuse when closed. Very lightweight, and the movements are easy to master. I believe it will handle the 600mm, but don't have one so not too sure. It handles my 300 without the front extension plate so it would pretty much have to (that about doubles length of camera).
I would agree with one other comment - go 4x5 and take a lot of Quickloads or rapid loads and get away from film holders (again a tank of a camera is the Toyo 45AX or AII).
Stew
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