400kg Swing-Back Boat Trailer Jack with 8 in Rubber Wheel | LF101-420

The Confirmed Specification Set for LF101-420

The Folding Function Is Mainly a Towing-Clearance and Storage Decision

A wheel-equipped jack extends below the trailer tongue while in its support position. A swing-back architecture allows the assembly to be moved out of that lower operating position before towing.

Replacement selection should check the real rotation envelope around the coupler, frame, winch post, bow stop and other nearby boat-trailer hardware.

GOODIN’sTrailer Jack Encyclopedia provides broader context on swing-back, fixed and other trailer-jack architectures.

Wheel Diameter and Jack Travel Solve Different Fit Problems

The 8 in wheel diameter affects ground clearance and how the support contacts the operating surface. The 12 in travel describes the jack’s adjustment stroke.

Neither value establishes the complete installed height range, and the 400 kg jack capacity should not be treated as a dynamic wheel-load rating for moving the trailer.

GOODIN’sTrailer Jack Selection Guide provides additional guidance on matching capacity, travel and geometry.

Zinc-Plated Outer Tube and Clear-Zinc Inner Tube

LF101-420 uses a zinc-plated outer tube and clear-zinc inner tube. These descriptions should remain distinct from hot-dip galvanizing or an unspecified “marine-grade” coating.

If a project requires a particular plating thickness, passivation system or corrosion-test result, define it separately in the purchasing specification.

Confirm the Mounting Interface and Folding Envelope Before Replacement Approval

The current specification verifies the jack class, capacity, travel, wheel and tube finishes, but does not publish the exact mounting hardware, frame-fit dimensions, handle style or overall height range. Those should be closed from the LF101-420 drawing or current product assembly before a bulk or replacement order is released.

Questions to Resolve Before Ordering LF101-420

Production Visibility for OEM and Distributor Buyers

Single-Wheel Swing-Back Support for Compatible Small and Medium Boat Trailers

LF101-420 belongs to GOODIN’s Boat Trailer Jack range and is designed around a 400 kg published capacity, 12 in adjustment travel and an 8 in rubber wheel.

Suitability should be determined from the actual vertical load at the jack position, the trailer tongue/frame geometry, wheel clearance and the available folding envelope.

Use the 8 in Rubber Wheel for Controlled Local Positioning on Suitable Surfaces

A single wheel can turn readily on smooth hard surfaces, but wheel diameter alone does not guarantee easy movement over gravel, soft ground, deep thresholds or slopes.

GOODIN’s tight-garage boat-trailer guide provides practical context for thresholds, turning resistance and controlled low-speed positioning.

Check the Swing-Back Path Before Treating the Jack as a Drop-In Replacement

The assembly needs sufficient space to rotate between the vertical support position and its folded towing position. Boat-trailer winch posts, bow stops, frame rails and coupler hardware can restrict that path.

Match 400 kg to the Actual Vertical Load at the Jack Position

A trailer jack supports the front portion of the trailer while uncoupled; it is not selected by copying the complete trailer weight. Confirm the load at the installed support position and preserve an appropriate margin under the manufacturer’s approved use.

Boat-Trailer Positioning Does Not Automatically Establish an Immersion Rating

The product is listed in GOODIN’s Boat Trailer Jack range and uses plated tube finishes, but the current specification does not publish immersion duty, coating thickness or salt-spray performance.

For repeated saltwater exposure or contractual marine-corrosion requirements, specify the required coating and maintenance regime separately.

LF101-420 is a tongue-support / positioning jack, not a road-wheel service jack. Do not assume the 400 kg rating authorizes axle lifting, tire changing or unrestricted trailer movement on the caster wheel.

What to Send with the LF101-420 RFQ

Provide actual jack-position load, trailer/frame dimensions, required mounting method, minimum and maximum support positions, folding clearance, ground surface, corrosion environment, quantity and destination market.