My TT is about 4500 Lbs, 22' and tandem axle. When unhitched and without the stabilizer jacks down: how much weight is required behind the rear axle to lift the tounge? When I had a popup this was...
We had the exact same size TT. I know that we had around #300+ of three people and #100 of bikes on the back and nothing ever happened. I don't think it's an issue. If you have stab jacks it can't move anyway.