Heavy duty lowering ball joint trailer arms (2″, 4″, 6″, 8″) for precise towing height adjustment. Durable trailer arm accessories for trailers, trucks, SUVs, and custom towing setups. OEM supplier with custom options.
The Lowering Ball Joint Trailer Arm from Rongda Metal is a set of heavy duty adjustable trailer arms specifically designed for lowering towing height, optimizing towing geometry and improving vehicle-to-trailer alignment. Available in 2″, 4″, 6″ and 8″ lengths, these trailer arms provide reliable strength, premium performance and long-lasting durability for demanding towing, hauling and trailer alignment applications.
A lowering ball joint trailer arm (also referred to as adjustable trailer arm, lowering tow arm, or ball joint trailer link) is a critical accessory for adjusting the trailer tongue height relative to the towing vehicle. By selecting the appropriate arm length — 2″, 4″, 6″ or 8″ — users can achieve the optimal towing height to ensure:
Proper hitch alignment between vehicle and trailer
Reduced stress on suspension components
Improved towing stability and handling
Reduced sway and uneven wear
These adjustable trailer arms are ideal for use with trailers, pickups, SUVs, utility towing rigs and aftermarket hitch systems. They are especially useful in fleet operations, custom tow setups and heavy-duty transport scenarios.
Choose from several arm lengths to fine-tune trailer hitch height and towing geometry for your specific vehicle and trailer configuration.
High-strength ball joint design provides secure articulation and load transfer, enhancing durability and steering alignment under towing stress.
Manufactured from premium high-strength steel or alloy with accurate machining to deliver superior load capacity and operational stability.
Surface treatments such as powder coating, zinc plating or galvanizing ensure excellent resistance to rust, abrasion and environmental exposure.
Straightforward bolt-on installation makes height adjustment easy and reliable without requiring extensive modifications to the trailer or tow vehicle.
Supports OEM customization including arm length ranges, ball joint configurations, finishes, branding and packaging — ideal for distributors and volume buyers.
| Specification | Detail |
|---|---|
| Product Name | Lowering Ball Joint Trailer Arm |
| Available Lengths | 2″, 4″, 6″, 8″ |
| Material | High-Strength Steel / Alloy |
| Ball Joint Size | Standard Greaseable / Sealed (model dependent) |
| Finish | Powder Coated / Galvanized / Zinc Plated |
| Application | Towing & Trailer Alignment |
| Mounting | Bolt-On |
| OEM/Custom | Supported |
| Origin | China |
A lowering ball joint trailer arm replaces or adjusts the connection between the trailer coupler and the tow vehicle’s hitch at the ball mount. By offering multiple length options — 2″, 4″, 6″, and 8″ — it allows:
Correcting Hitch Height Differences: Match trailer tongue height with tow vehicle hitch height for level towing.
Reducing Suspension Stress: Reduce upward or downward pull that can cause uneven load or premature wear.
Improving Handling: Balanced trailer orientation improves steering and dynamic stability.
Optimizing Load Transfer: Better weight distribution for safer towing.
Installation Steps (Typical):
Remove existing arm or linkage from hitch and trailer coupler.
Align and mount the selected trailer arm length.
Secure bolts to specified torque values.
Test alignment and adjust if necessary.
Precision Engineering: Accurate machining and design for optimal fit and performance
Heavy Duty Strength: Built to handle frequent towing and load stress
Adjustable Versatility: Multiple lengths for fine-tuning towing height
OEM & Custom Capabilities: Tailored solutions for global partners
Corrosion Resistant: Durable finishes suitable for harsh environments
Global B2B Supplier: Reliable China factory with export logistics support
No. 7, inside No. 345, Linfu West Street, Yingdong Village, Beian Sub-district Office, Jimo District, Qingdao City, Shandong Province
