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.
Recently viewed
New & Updated RV Parts Inventory — Check Back Often
We’re always adding new and used RV parts to our inventory, so be sure to check back regularly.
If you don’t see the part you need today, we may still have it in stock—our internal database includes thousands of new RV parts that are not yet listed online.
Text or email us with the product number or model, and we’ll check availability for you right away.
Our Products