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Trailair King Pin Box - L05

Catalog Item # 64853
This Item is In-Stock and Ready to Ship
$1,299.99   SAVE $147.46 (11%)
Freight: $200.00
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The beauty and reliability of the Trailair air ride systems is their simplicity.
The air ride pin box acts as a buffer, arresting the transfer of road impact between the tow vehicle and the coach to produce smooth, stabilized towing performance.

Generally, a truck and a trailer connected by a ridged hitch system (basically any standard fifth wheel or ball connection) will tend to fight each other as you travel at highway speeds. The faster you go and the worse the road conditions, the more the ride quality suffers. Not only are you dealing with road forces from traveling down the road, but also additional forces are created as the two vehicles fight each other causing a "diving board" effect.

The Trailair coupler's unique scissor action allows the air spring to absorb these forces and dissipate them and for the shock absorber to handle the rebound effect. The result is an improved ride for the truck and it's occupants, the coach and its contents.


  • Air ride pin box
    • Cushions and absorbs road shock
    • Improves handling and overall ride
    • Limits strain on truck and trailer frames

  • Smooth, stable towing

  • Scissors action, transfers shock to the air bag
    • Internal air bag absorbs the road shock
    • Built-in spring ensures that pin box rebounds - keeps air bag from breaking down

  • Improves the overall ride while protecting the 5th wheel trailer

  • Improves handling and enhances towing performance

  • Available for most frames

Technical Specs

Tech Specs

Weight: 150 lbs.

Warranty: 1 Year Warranty

Manufacturer: Ultra-fab Products

Mfg Part #: 35-946203

Tech Notes:

Designed to replace the following pin boxes: Lippert 1621

Weight capacity: 18,000 lbs

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Q & A

Product Question & Answer

2 questions : 2 answers
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Is this pin box a universal fit?
1 answer(s)
Can the Superglide Capture Plate be added to this product without any modifications?
1 answer(s)

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