Upload & Sell: On
Hanging some weight on it is a good idea. I do it all the time.
Definitely get/bring a cable release.
With my travel setup (Gitzo Traveller tripod/Markins Q3) vibration is easy to induce with the slightest touch, especially noticeable on telephoto lenses.
But wind can also be a problem, especially with a lightweight tripod setup.
A camera strap flapping around can be real issue.
Usually I turn off IS on a tripod, but in windy conditions, I'll usually turn it on.