LA-401 — Silver complete exterior ladder
Silver universal exterior ladder with roof and rear-wall attachments. The finished installation must be cut and secured to the RV's structural backing.
View LA-401 productStromberg Carlson LA-401 / LA-401BA RV Ladder Parts Diagram
Identify repair and mounting parts for the Stromberg Carlson LA-401 silver and LA-401BA black universal exterior RV ladders. The factory drawing numbers the top and bottom ladder sections, four stand-offs, two swivel hinges and roof mounts. Use that drawing with the part numbers and product photos below before choosing a replacement.
Numbered exterior ladder assembly drawing
Stromberg Carlson's LA-401 / LA-401BA installation manual (PDF) shows callouts 1 through 7, original mounting hardware quantities, 12-inch rung spacing and the placement of the wall stand-offs. Compare each numbered component with your existing ladder.
Find the part number in the factory drawing
| Key | Part number | Component |
|---|---|---|
| 1 | 1LA-401-A1 / 1LA-401BA-A1 | Two top U-shaped ladder sections |
| 2 | 1LA-401-A2 / 1LA-401BA-A2 | One straight middle ladder section |
| 3 | 1LA-401-A3 / 1LA-401BA-A3 | One bottom J-shaped ladder section |
| 4 | 8535 / 8535-B | Four 5-inch rectangular-base stand-offs, silver / black |
| 5 | 8525-BK | Two swivel hinges joining the straight and J-shaped sections |
| 6 | 8521-BK | Two roof mounting brackets |
| 7 | 1LA-401-B | Fasteners for section joints, mounts and stand-offs |
Complete ladders and matching replacement parts
LA-401BA — Black complete exterior ladder
Black version of the LA-401 ladder. Use the finish-specific black ladder sections when replacing major structural pieces.
View LA-401BA product8535 — Five-inch rectangular-base stand-off
Factory drawing item 4 for the silver LA-401. The completed ladder uses four stand-off assemblies; replacement units are sold individually.
View 8535 product8531 — Trimmable 12-inch round-base stand-off
Long round-base stand-off for other compatible exterior ladder installations. Different from the 5-inch rectangular-base assemblies supplied with the LA-401.
View 8531 product8531-B — Black 12-inch round-base stand-off
Black counterpart to the trimmable 12-inch round-base stand-off. Compare the base shape and tube reach before replacing an existing mount.
View 8531-B product8540-NT — Replacement aluminum rung with caps
Single replacement tread supplied with its own end caps and screws. It can be fitted without completely disassembling the ladder.
View 8540-NT productFive-inch versus twelve-inch stand-offs
8535 and its black 8535-B counterpart are 5-inch assemblies with rectangular bases, identified as key 4 on the LA-401/LA-401BA drawing. The 8531 and 8531-B parts are 12-inch trimmable stand-offs with round bases, used with other compatible exterior ladder mounting arrangements. Match the existing base and required wall-to-tube distance; these are not automatically interchangeable.
Replacement rung and end-cap differences
The 8540-NT silver replacement tread includes end caps and screws and can be fitted without completely dismantling the ladder; the black tread is numbered 8540-NTB. For an existing original-style rung, Stromberg lists 8539-CP as the press-in black end cap. The later replacement tread uses the screw-in 8540-CP end cap with three holes. Match the rung style before buying a cap alone.
Hinges, roof brackets and connecting nuts
The original assembly uses 8525-BK swivel hinges at the joint between the middle and lower sections and 8521-BK roof mounting brackets at the top. FST-9975 is an internal connector nut used in stand-off assemblies. It is not a substitute for the complete hinge or roof bracket.
Measuring and mounting safely
The manufacturer shows a 92½-inch assembled-height reference with approximately 12 inches between treads. The kit includes extra tube material to trim to the RV's contour; keeping additional height may require a separate tread. For the standard assembly, keep approximately 5 inches between the rear wall and ladder uprights and position the lower attachment above the bumper as directed by the installation manual.
Every roof and wall fastener must anchor into suitable structural backing, not only the outer RV skin. Locate the RV's framing before drilling, use a compatible exterior sealant around penetrations and do not use a ladder with loose stand-offs or a damaged swivel joint. Stromberg rates the properly installed ladder at 250 lb maximum.
For other ladder types and parts, browse RV and camper ladders. Interior bunk ladders use different mounting hooks and tread parts.
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