What is the best way to move bagged frangipani trees?

A refrigerator trolley is good for moving large and heavy frangipanis. A second person and a wheel barrow is useful for moving small 45 litre frangipanis long distances. If you need to transport frangipanis in ute or trailer, the wind will damage the leaves and may damage the branches.
If the branches are upright, you might be able to lay it down with the trunk resting on something. You should also put something either side of the bag to stop the bag from rolling sideways.