I know this is *possibly* a disaster waiting, but I am guilty of carrying my 5D2 + 17-40 on a tripod without any safety straps.
I use RRS L bracket to RRS quick release clamps with a Manfrotto 488RC2
to a RRS TVC-33. Eventually I will upgrade to the RRS BH-50.
Any of you carry your camera on tripod without safety straps? Any horror stories? I wouldn't mind having a safety strap that connects the camera and tripod, but the RRS system is as solid as it gets.

I've been looking for a second lens-to-tripod connection to avert a disaster and found this link that you may find of interest. 
