JT's Strong Arm or U-F Eliminator installation question

Remember that you are still just bracing against your "flexi-frame." Did you install the extra stabilizer jacks near the axles? Since I removed the play from the tongue jack and added the extra stabilizers, I see no need for the parts you propose. As you know we have the same model trailer.

With arms that you propose and X-chocks there is still nothing to stop movement in the center of the trailer, where it is just supported by rubber donuts and springs.