BOYISEN RV Slide-Out Support Jacks 20–49 in Adjustable, 5000 lb Capacity — Galvanized Steel, Drill/Crank Adjustment

BOYISEN RV Slide Out Support Jacks are adjustable stabilizer stands that brace and steady slide-out compartments on campers and trailers, offering up to 5000 lb capacity per jack and a 20"–49" height range.

When you park your motorhome or travel trailer, the extended slide-out can wobble, sag, or place extra stress on rails and seals. These BOYISEN slide-out supports provide a fast, tool-assisted way to add rigid backing under the slide assembly so the living space feels steadier and the hardware receives less long-term strain. They are built from galvanized steel for rust resistance and include both a hand crank and a drill-socket for quick height changes.

How do these supports install and adjust?

Installation is straightforward and designed for a single person. Set the U-shaped top under the slide frame, choose the hole position for coarse height, then fine-tune the threaded column using an electric drill or the included crank.

• Place U-top against slide-out frame for secure contact
• Select pin hole for initial 20"–49" extension
• Use drill socket for rapid thread rotation or hand crank for controlled adjustments
• 5" diameter base distributes load to resist sinking on soft ground

What protection do these jacks offer to slide-out mechanisms?

These supports reduce deflection and bending by transferring some of the slide-out load down to the ground rather than the slide rail itself. That lowers stress on seals and rollers, helping preserve alignment and operation over time.

• Prevents excessive sagging of rails and frames
• Reduces vibration and side-to-side movement while parked
• Helps maintain seal compression to limit water intrusion risk
• Galvanized finish resists corrosion in outdoor environments

Are these jacks strong and safe to use?

Each jack has a rated capacity up to 5000 pounds and is constructed from heavy-gauge steel, but they are intended for stabilizing and supporting slide-outs, not lifting the entire RV. Use them as supplemental support while the RV is stationary and on level ground.

• Heavy-duty steel body with corrosion-resistant plating
• Rated load capacity provides robust support for most slide-outs
• Wide circular base improves footprint on various surfaces
• Includes safety note: not a primary lifting device for jacking the RV chassis

Who is this for? BOYISEN slide-out support jacks suit RV owners who frequently use slide-outs and want a simple way to improve on-site stability and protect slide mechanisms. They are a good fit for campers, travel trailers, and motorhomes with accessible slide frames where added under-support will reduce shaking and long-term wear. The pair format covers two sides for many standard installations; consider additional supports for very large or unusually configured slides. If you need help choosing or fitting these supports, BOYISEN customer service is available to answer product-specific questions.