G'day & Welcome.
Have a good think about what changes you might make to the trailer before you order your tent. For instance, if you changed the wheels and tyres, maybe even matching your tow rig, would that reduce the height? Maybe load it up with a few hundred kg of whatever and see what happens. Of course, when you flip the tent over you take some load off the suspension so you'll need to account for that.
Good luck, looks like a great project.