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...
Axles are typically approx. 2/3 the way from the coupler to the bumper. If tongue weight was 500 lbs for ex., you'd need 1,000 lbs on the bumper to balance out the tongue wt. to zero. You're never ever going to see that kind of wt. on a bumper (or near it inside) unless you had a Harley (or two on a longer trailer) on a carrier...