RV Slide Out Support Trailer Stabilizer Jacks - 21.4 to 40 in

Our review of these RV slide out support trailer stabilizer jacks finds them best suited for RV owners who want a straightforward way to stop slideout wobble without lifting the trailer. The kit includes two heavy duty steel jacks with a travel range of 21.4 to 40 in and a 5,000 lb lift capacity each, and in everyday use they deliver solid, vibration-reducing support for parked campers and travel trailers. Installation is simple, the zinc powder-coating holds up to weather, and the U-shaped tops fit most slide-out frames when paired with a protective 2x4.

Key Features

• Adjustable travel range: The 21.4 to 40 in travel allows fitting beneath most slide-out assemblies and provides a useful span for parked stabilization.
• High lift capacity: Each jack is rated to 5,000 lb, offering robust support for resisting movement from occupants and activity inside the trailer.
• Durable construction: Heavy duty steel bodies with a zinc powder-coating resist rust and corrosion for longer outdoor life.
• Matched threaded system: The triangular threaded screw and M18 nut pairing gives predictable, reliable adjustment under load.
• U-shaped top fit: 5.94 in x 2.95 in x 0.9 in U-shaped tops fit most slide-out frames and work better with a wood 2x4 to prevent damage.
• Pair included: The pack of two lets users stabilize both sides of a slideout without buying separate units.

Who It's For

These stabilizer jacks suit RV and travel trailer owners who need to eliminate slideout bounce and improve interior stability when parked. They are especially useful for families or anyone who notices rocking when people move inside the camper and want a simple, mechanical fix rather than a complex system.

They are not for those who expect to level a trailer or lift a trailer off its wheels, since the manufacturer explicitly warns against using them to raise the trailer for maintenance or full leveling. RV owners seeking a multi-point leveling system or jacks designed to lift an axle should look elsewhere.

Pros & Cons

Pros

• Stabilizes slideouts effectively and reduces interior wobble under normal use.
• Strong 5,000 lb capacity per jack provides confidence under load.
• Built from heavy duty steel with zinc powder-coating for corrosion resistance.
• Easy to install and includes two jacks for paired stabilization.

Cons

• Not intended to level or lift the trailer off its wheels, so additional equipment is required for those tasks.
• U-shaped tops can mark frame metal if a protective 2x4 is not used as recommended.

Specifications

Travel Range	21.4 to 40 in
Working Range	19 in
Max Lift Capacity	5,000 lb each
Top Dimensions	5.94 in x 2.95 in x 0.9 in U-shaped
Material / Finish	Heavy duty steel with zinc powder-coating
Included	Pack of 2 quick lift stabilizer jacks

Our Verdict

For RV owners who need a durable, easy-to-install way to stop slideout movement, these stabilizer jacks offer strong support and clear value. They perform exactly as intended for reducing wobble and are built to resist corrosion, but they should be used only for stabilization, not for leveling or lifting the trailer.

Frequently Asked Questions

Can these jacks lift the trailer?
No. They are designed to prevent slideout and cabin rocking while parked, not to lift the trailer or replace axle jacks.

Do the tops fit most slide-out frames?
Yes. The 5.94 in x 2.95 in U-shaped tops fit most frames, and using a wood 2x4 over the top is recommended to avoid frame damage.

How many jacks are included?
The product ships as a pack of two quick lift stabilizer jacks, sufficient for stabilizing a single slideout on both sides.