Will the Flex Air Pin Box be at the Same Height as the Factory Pin Box on a 5th Wheel Trailer

Question:

If I replace my 1621 pin box with a LC328492 using the same bolt holes, will the king pin height be the same? I have a tall truck and my camper is already riding a little high in the front and I am out of adjustment holes.

asked by: Eddie

Expert Reply:

Yes, the positioning of the Trailair Flex Air pin box # LC328492 will be approximately the same as the factory hitch on the trailer. It may be a little different once you add or remove air from the air bag as needed. To lower the front of the trailer as much as you can you can mount the pin box as high up as it will go. And most 5th wheel hitches are also height adjustable so if you can lower yours it will help too.

The other option is to raise the back of the trailer to compensate for the trailer riding high at the front. If you do think raising the trailer in the back is the way to go then you may be able to use an over/under conversion kit if:

The trailer leaf spring stack is currently mounted under the axles
The trailer uses double-eye springs
And the trailer has 2-3/8 inch or 3 inch diameter round axles

For a 2-3/8 inch round axle use # K71-384-00 and for a 3 inch diameter axle use # K71-385-00.

If you cannot use an over/under conversion kit then the only other way to raise the height of the trailer is to have the old suspension hangers cut off and new, taller ones welded on by a qualified professional welder. I have included a link to the hanger main page for you.