On my old trailer I had the JT system with a front landing gear and rear stabilizers. It definitely helped, but there was still bouncing from the tires being part of the system. On my new trailer I have the 6 point leveling with no JT system. It is more stable than the old trailer, mostly because the tires are (mostly) out of the support system when parked. There is some movement and the JT system may help in the front, but you'd have trouble mounting it in the back. I don't feel I need it with this setup.