The Stromberg Carlson LA-401 (silver) and LA-401BA (black) are adjustable rear-mounted RV ladders with separate roof brackets, wall stand-offs, hinges and replaceable treads. The numbered factory assembly drawing below helps you find a damaged part before choosing a replacement.
Start by checking which ladder you have and where its brackets anchor into the RV. The ladder tubing and hardware can be adjusted for different rear-wall shapes, but a secure installation depends on structural backing at every mounting point.
LA-401 and LA-401BA: model dimensions
Both finish versions use the same overall ladder layout. The installer can shorten the tubing to suit the RV. Stromberg Carlson specifies 92½ inches in its assembled dimension drawing to maintain 12-inch tread spacing; the additional supplied tubing is not a reason to increase the distance between treads.
Original manufacturer ladder assembly drawing
Match the numbers in the drawing with the service-parts table. It shows the roof U-shaped sections, central rail, lower J-shaped section, wall stand-offs, swivel hinges and roof anchors.
The manufacturer drawing opens in your phone's PDF viewer so you can enlarge individual brackets, tread spacing and part callouts.
Open original manufacturer illustration (PDF)Numbered LA-401 ladder parts
| Diagram callout | Manufacturer identifier | Part or purpose | What to compare |
|---|---|---|---|
| 1 | 1LA-401-A1 / 1LA-401BA-A1 | Pair of top U-shaped roof ladder sections | Finish, bend, mounting holes and roof attachment |
| 2 | 1LA-401-A2 / 1LA-401BA-A2 | Central straight ladder section | Tread positions and 1-inch rail diameter |
| 3 | 1LA-401-A3 / 1LA-401BA-A3 | Lower J-shaped ladder section | Bottom mounting shape and hinge connection |
| 4 | 8535 / 8535-B | Five-inch wall stand-offs; silver or black | Rectangular base, length and wall backing |
| 5 | 8525-BK | Swivel casting / ladder hinge | Orientation for a flat or curved rear wall |
| 6 | 8521-BK (finish-dependent bracket version) | Roof mounting brackets | Original roof bracket, tube size and mounting locations |
| 7 | 1LA-401-B | Assembly screws, bolts and nuts | Fastener size and count in the correct kit |
A damaged rung is a separate repair from a cracked bracket. Stromberg Carlson identifies 8540-NT as its silver replacement tread supplied with end caps and screws, and 8540-CP as the screw-in end cap for a replacement tread. The screw-in cap is not the original press-in cap, so compare your rung style before ordering a cap alone.
Shop complete ladders and matching replacement parts
Use the complete ladder model and the numbered part identifiers when selecting an individual support, hinge or tread. Each link opens the corresponding NewRVParts listing.
Before replacing the ladder or mounting hardware
Confirm the ladder's rear-wall contour, its upper roof attachment, the available rear-wall clearance and the location of structural framing. Every mounting screw must engage the RV's backing or subframe. Do not attach a roof-access ladder only to thin exterior wall skin; contact the RV manufacturer or a qualified installer if the framing location is unknown.
Stromberg Carlson specifies outdoor sealant at the drilled mounting points and separate hinge orientations for flat and curved walls. Do not assume a bolt pattern or damaged bracket is safe to reuse. Use the original assembly instructions for drilling, spacing and fastener placement.
For the illustrated replacement-component overview, open the Stromberg Carlson 2026 parts catalog (printed page 20). The manufacturer's current replacement-part list provides the original service identifiers.
Need a removable lower ladder to reach the first rung? See the Stromberg Carlson starter and bunk ladder guide. For other RV hardware, return to our parts diagram index.