Does anyone regularly carry their 4x5 w/ lens on their tripod? I've been detaching my TK, bellows, and lens, and putting everything back in the backpack to move from one location to another while shooting. The reason being my worry that my TK might fall off the tripod (Feisol CT 3441S with Bogen 3047 pan/tilt head). But folding up and then constantly refolding the TK, while easy, is a bit of a PITA. Are my concerns about the ability of the tripod / head to hold the TK justified? Anybody have any experience with a disaster? Thanks!