Between 8.5' and 9.5'. To put it in a container, the awning and all the brackets on the sides will need to be removed, and you may need to remove the tires, and use only wheels, to get it in the container. Even then, it will be close. If it has a factory air conditioner, it may be riveted on the roof, and you will need to remove the rivets to get the air conditioner off. Don't leave anything of value in the trailer, it will not be there when it arrives at its destination.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.