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Comparing Lippert Components Trailair Pin Box To Trailair Flexair Pin Box


Hi can you please explain the difference between Trailair King Pin Box - L05 and the Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 and 1621HD LC158778. Are they both long jaw and is it that the L05 is 18000 lbs and the LC158778 is 21000 lbs rated and that both have the air bag. Regards.


Expert Reply:

The Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs # LC158778 and the Trailair Flexair 18,000 lb # LC328492 are more similar than different. The major difference that you stated is the capacity and the second notable difference is the Flexair 18K has a rubber compound built into the head assembly as the first defense against road shock.

If your trailer's GVWR is under 18,000 lbs, I recommend the Trailair Flexair 18K # LC328492 due to the extra layer of shock absorption. I've attached a photo of just that portion to assist.

click to enlarge
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