JT's Strong Arm Jack Stabilizers system is a one time, permanent installation that virtually eliminates chassis movement in travel trailers and eliminates the need for ineffective tripods. These will work for travel trailers only. STABILIZE ALL TYPES OF JACKS The patented universal system is designed to attach to the three main types of jacks found on RVs: Scissor, Electric and Telescoping. Each kit contains six stabilizer tubes. Four attach to the front of the coach and two on the rear. It's a bolt-on kit designed for installation by your dealer or the do-it-yourselfer. THE POWER OF TRIANGULATION Using a unique system of custom designed and engineered clevises, swing-bolts and mounting hardware, one end of each stabilizer tube attaches to a leveling jack and the other end to the RV frame, forming a rigid triangle €“ the strongest shape in nature! There's no welding required and no need to remove and reattach during set-up. It's permanent! When parked, JT's Strong Arm Jack Stabilizers telescope into place with the jack and a twist of the "T" Handles locks the system in place. It's that simple! Order your set today! The T-Handler Only. TRAVEL TRAILER ONLY.Eliminates annoying chassis movementProvides a rock-solid camping experienceDealer installation or do-it-yourselfOne-time installation/permanently attachedWorks with most jack applicationsBolt-on installation; no welding requiredIf unit has hydraulic jacks, three #314592 jack adaptor lugs are required not includedIf unit has electric stabilizer jacks, one #314597 adaptor kit is needed per set of electric stabilizer jacks not includedJT's Strong Arm Jack Stabilizer system for travel trailers is a one time, permanent installation that virtually eliminates chassis movement in fifth wheels and travel trailersStabilizers telescope into place when the jacks are loweredTurn of the "T"- handle on each stabilizer locks the system in place for a rock-steady RVStabilizers retract with the jacks