I've backpacked quite a bit, and usually with camera gear. I like the contemplative pace of 4x5 in the field, but in these post-quickload days the film takes up quite a lot of space in the pack. You list yourself as medium format, and I think a tlr or Texas Leica would be a great option. As for a tripod, I find a Tilt-all does the job nicely. Just keep everything in stuff sacks so that it stays dry.
P.S., backpackers' ponchos are your friends.