🔧 Curt 28911 — Replacement Marine Jack Mounting Bar Kit for Bolt-On Swivel Trailer Jacks

Re-mount or replace the mounting hardware on your bolt-on marine swivel jack with the Curt 28911 mounting bar kit. It includes two bolt-through mounting bars plus four bolts and four nuts — everything needed to secure a swivel trailer jack to a frame between 2" and 5" tall. A direct replacement for bent, corroded, or stripped mounting bars, and a drop-in interchange for the RAM MJ-1500B-MBB and MJ-1000B-MBB hardware kits. If the jack itself is still serviceable but the mounting bars are damaged, this is the fix.

⚙️ Key Features

• Curt 28911 Replacement Hardware — Manufacturer mounting bar kit for bolt-on marine swivel trailer jacks
• Complete Kit — 2 bolt-through mounting bars + 4 bolts + 4 nuts; nothing else to source
• Four-Bolt Pin-Through Design — Stronger side-load support than single-bolt mounting
• Wide Frame Range — Fits 2x2, 2x3, 3x3, 3x4, and 3x5 trailer frames (2"–5" tall)
• Marine-Ready — Built for boat-trailer environments with constant salt, moisture, and UV exposure
• Direct RAM Interchange — Replaces RAM MJ-1500B-MBB, MJ-1000B-MBB, and MGA-1000B-MBB mounting kits

📐 Specifications

• Brand: Curt
• MPN: 28911
• Interchange / Replaces: RAM MJ-1500B-MBB, MJ-1000B-MBB, MGA-1000B-MBB
• Kit Contents: 2 bolt-through mounting bars + 4 bolts + 4 nuts
• Mounting Style: Bolt-on, four-bolt pin-through
• Compatible Frame Heights: 2"–5" (fits 2x2, 2x3, 3x3, 3x4, 3x5 frames)
• Application: Bolt-on marine swivel trailer jacks (sidewind & topwind)

✅ Compatible Applications

• Curt bolt-on marine swivel jacks
• RAM bolt-on marine swivel jacks — MJ-1200B, MJ-1206B, MJ-1500B, MJ-1500B-DWL, MJ-2500B
• Most 1,200–2,500 lb bolt-on swivel marine jacks mounted to 2"–5" frames

🔧 Installation Notes

• Position the two mounting bars on either side of the trailer frame at your desired jack height
• Insert the four bolts through the bars, jack mounting plate, and trailer frame; secure with the included nuts
• Confirm the frame is between 2" and 5" tall before ordering — this kit is not designed for frames outside that range
• Typical jack-plate hole spacing: 5-1/2" center-to-center (width) x 4-7/16" center-to-center (height)

📞 Questions? Call or text us: 517-225-1991 | AAATrailer.com — Howell, MI · Same-day shipping on most in-stock orders · Largest online selection of trailer parts in Michigan

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• Address: 4675 East Grand River Ave, Howell, MI 48843
• Phone: (517) 225-1991 (Call or text)
• Hours: Monday to Friday: 10:00 AM - 5:30 PM | Saturday: By appointment

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 We will be happy to assist you with eligible returns, the return instructions, and the shipping address. If you need a return or exchange, send us an email so we can discuss a replacement.