At one time torsion axle mfg recommended towing level . Maybe they still do.
Towing nose high can have the last axle on the trailer carrying more weight regardless of suspension type. How much can only be determined by individual axle weights.
A 14.5 gvwr trailer can have over 3000 lbs of hitch weight leaving approx 12k lbs on a tandem axle trailer or around 3000 lbs per tire at the most.
Towing nose high can lead to tire flat spotting on the front axle caused by uneven braking performance between the axles....especially on wet pavement.
For just 250 mile trip and load G 110 psi rated tires pump those on the rear axle to 100+ psi to keep heat down and make that trip.