well.... general rule is to keep magnets and such away.. meaning if u are transporting.. keep the magnets in the trunk and your gear in the front or back seat.. and u'll be fine.
Put your camera and lenses inside their bag on the floor, either in front of the back seats or in the front, but never on the seats. If you have to hit the brakes your bag will fly forwards and land heavily on the floor anyway, you could wrap the seat belt around the bag, but I've seen it move anyway.
Just a hint, other than that I've really learned a lot from this thread.
Mark



