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Old 11-02-2004, 04:28 AM   #15
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Originally Posted by Janet's Husband
What are we talking about here, weight wise for the tow?
I have a 3000lbs trailer being towed by a 2500HD Duramax truck.
Would it matter if I used one of these hitches?
Are the advantagious for just heavier rigs, or would light loads see some good from it?
It sounds like a good idea, any thoughts on the tow weight issue.
Shoot them an email and they will respond promptly with the pricing. IIRC the basic unit was around $650. When we get ready to start towing on a regular basis I am defintely looking into it.


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Old 11-02-2004, 04:32 AM   #16
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Aaron, I believe the basic unit is $650, shipping included.

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Old 11-02-2004, 08:36 AM   #17
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Originally Posted by Rick Alston

I've got to believe that anytime you dampen movement between the trailer and the tow vehicle, both the trailer and the tow vehicle are better off from a vibration perspective. If that is true, then the vibration (energy) created by the trailer hopping about is absorbed by the hitch because it is not felt in the tow vehicle.

Over59 has a valid observation about bad axles. The air hitch isolates the driver and tow vehicle from vibration caused by the trailer. If that permits the driver to feel comfortable driving at higher speed, it may make the vibration in the trailer worse.

Each vehicle has a resonant frequency determined by its suspension and wheelbase. Think of them as giant tuning forks. If you have a rigid connection between the tow vehicle and the trailer, you have two tuning forks connected at the handles, and the vibration of one vehicle can influence the other.

If you insert a rubber pad between the two tuning forks, you isolate the two vehicles and allow them to vibrate closer to their natural frequency. This may reduce harmful vibration, assuming that the vehicle suspension was well designed and loaded. In the case of some trailers, this may not be a valid assumption.
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Old 11-02-2004, 09:02 AM   #18
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I believe Andy has made the point in past comments that many of the vehicles we are towing Airstreams with today are harmful to the trailer because they have harsh, heavy-duty suspensions which manhandle the trailer through the, three-quarter and one-ton pickups. He has observed that in the "old" days, we used to tow them very successfully with the large passenger cars common to those days, which had relatively soft suspensions and did not harm the trailers. I believe this. I used to tow my Airstream with a 76 Ford Custom 500, and the suspension was a powderpuff compared with my F250 Powerstroke today. Both tow my unit well. It's just that the soft suspension of the sedan had to be kinder and gentler to the trailer than the tough suspension of the F250 diesel.

That's why I'm planning to install the air suspension hitch. It does make sense. Maybe it will stop the interior skin cracks I seem to be getting more and more of in my kitchen roof area, and maybe stop the occasional popped rivet. The Airstream's torsion suspension is the best available for trailers, and if the tow vehicle just leaves it alone and doesn't send harsh vibrations to it through the hitch, I bet the Airstream would be a happy puppy.
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Old 11-02-2004, 09:57 AM   #19
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Added on top of the harsh, heavy duty suspension of the tow vehicle is the effect of over-sized weight distribution hitches. If the connection between the tow vehicle and the trailer is made more rigid, there is more transfer of vibration between the tow and the trailer.

There is some damping of the vibration due to the energy absorbed by the spring bars. The impulse energy is also distributed more evenly among all the suspension components of the trailer and tow vehicle. But as the spring bars get bigger and tighter, the tow vehicle and the trailer begin to act more like a single unit, with a resonant frequency that is bad for both the driver and the trailer.

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