Clay,
I don't know that you are going to find a ready made pack that is going to serve your needs. Back when I still shot 12X20, I was thinking of going with an external frame pack and having someone make the necessary campartments for film holders, lenses, camera etc. These could easily be lashed to the pack frame...My 12/20 already came with a canvas enclosure for camera/film holders. In that arrangement, the film holders served to protect the ground glass.
Carts seem to be pretty limited in rough terrain...at least in my view.
Kevin Saitta comes to mind of someone who probably sew up anything that you need.
Bookmarks