I learned the hard way to travel with my table in the one leaf open position.
Being a good Marine, and knowing that all stowable things must be stowed, I travelled with table closed and suspended against the bulkhead on our '76 Safari until the downward pressure on the piano hinge tore all the screws out (Somewhere on one of Arkansas' fine highways, or was it Mississippi?). The bathroom mirror ripped itself from the rear wall on that same section of road.
After repairing the table, we subsequently made two more cross-continental trips with the table open and sustained no damage. I can report the same outcome of travelling with table open on my 2000 Safari and more recently my 1976 Sovereign
If you just never use your table, be sure incorporate a wedge into your travel checklist to take the weight off the hinge and keep it from swinging itself off the wall.