Description
The Lippert 158778 Trailair Air Ride Pin Box is a premium upgrade designed to improve towing comfort and reduce stress on your fifth wheel trailer and tow vehicle. Engineered with an advanced air bag and gas shock system, this pin box absorbs road shock and minimizes fore-to-aft movement (chucking) for a smoother, more controlled ride.
With a 21,000 lb gross weight capacity, this air ride pin box is built for durability and performance. It is designed as a direct replacement for Lippert 1621 pin boxes, making installation straightforward while delivering immediate improvements in ride quality and trailer protection.
Key Specifications
- Manufacturer Part Number (MPN): 158778
- Product Line: Trailair® Air Ride
- Type: Air Ride Pin Box
- Coupler Type: King Pin
- Gross Weight Capacity: 21,000 lb
- Length: 28-11/16 Inch
- Width: 12 Inch
- Bolt Pattern: 2 Row
- Horizontal Bolt Spacing: 7-3/4 Inch
- Vertical Bolt Spacing: 2 Inch
- Material: Steel
- Finish: Black Powder Coated
- King Pin: Included
- King Pin Locking Wedge: Included
- King Turret: Included
- Turret: No
- Spacers: Not Included
- Quantity: Single
- Condition: New
Features & Benefits
- Air bag and gas shock system absorbs road shock and vibration
- Reduces chucking (fore-to-aft movement) for smoother towing
- Improves ride comfort and driver control
- Helps protect RV frame and contents from damage
- Designed as a direct replacement for Lippert 1621 pin boxes
- Heavy-duty steel construction ensures long-term durability
- Powder-coated finish resists corrosion and wear
- Provides a smoother, more stable towing experience
Fitment Notes
- Designed to replace Lippert 1621 pin box configurations
- Compatible with fifth wheel trailers using standard king pin couplers
- Verify bolt pattern and mounting dimensions before installation
- Professional installation recommended for optimal performance
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