JB-246 Jack-in-a-Box slide-out stabilizer set
View JB-246 productStromberg JB-246 Jack-in-a-Box Slide-Out Stabilizer Parts Guide
The Stromberg Carlson JB-246 Jack-in-a-Box is a pair of manually adjustable stabilizers designed to reduce movement in a compatible extended RV slide-out. Each stand has a removable U-shaped frame-contact top, an adjustable section, a quick height-lock feature and a folding handle for fine adjustment. These are stabilizers, not leveling or lifting jacks.
Identify the JB-246 assembly
| Specification | JB-246 manufacturer reference |
|---|---|
| Product identification | JB-246 — Jack-in-a-Box |
| Quantity | Two stabilizers per carton |
| Adjustment range | 20–46 inches in the current Stromberg catalog |
| Stabilizing load | 5,000 lb per jack listed in the 2026 catalog |
| Frame contact | Removable U-shaped top for a suitable slide-out frame location |
| Operation | Snap-and-lock height adjustment with a foldable fine-adjustment handle |
| Finish | Powder-coated and zinc-plated components for corrosion resistance |
Component identification
1Removable U-top
Contacts a suitable structural frame position rather than a thin skirt or body panel.
2Threaded top adjuster
Makes controlled final contact after the stand is positioned at the required height.
3Folding hand crank
Turns the fine-adjustment assembly and folds in for storage.
4Snap-and-lock height section
Provides the main height adjustment within the model's stated range.
5Lower support column and base
Transfers the stabilizing contact to a firm and level supporting surface.
This is a conceptual component reference rather than a factory exploded diagram. The allowable contact point depends on the slide-out manufacturer's construction.
What the stabilizers do—and what they don't
The JB-246 is meant to steady an extended slide-out after the RV is correctly parked, leveled and supported by its normal leveling or stabilizing equipment. It is not designed to raise a slide-out room, correct a sagging mechanism, level the RV or support the trailer for maintenance. Consult the slide-out system manufacturer's instructions before using supplemental supports; some slide mechanisms may not permit them.
See the matching JB-246 product
View JB-246 productPlacement and operation checks
- Park and stabilize the RV using its approved equipment, and extend the slide-out normally.
- Confirm the slide-out maker allows separate supports and identify appropriate structural contact points.
- Measure the distance from level ground to the contact point. The current JB-246 set is listed for 20–46 inches.
- Use the height adjustment and fine-adjustment handle only to obtain gentle stabilizing contact—never jack the room upward.
- Remove both slide-out supports before retracting the room or moving the RV.
Manufacturer product reference
See Stromberg Carlson's Jack-in-a-Box product reference and its 2026 catalog, printed page 16 for the JB-246 component views and adjustment specifications.
For a completely different type of stabilizer that supports the RV frame after parking, compare the Valterra wheel-chock and cross-frame stabilizer guide. These components perform different jobs.
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