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Old 11-11-2015, 02:33 PM   #15
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Thank you Andy for the additional input.

Always good to remember on a forum the wide chasm between opinion, fact, fiction, bs etc.
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Old 11-11-2015, 03:04 PM   #16
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Just to clarify the physics behind the argument for shocks. Shocks are a dampener. That's it. That's all they do. They resist movement in either direction of travel at all times at a constant rate (unless it is a multivalve unit). The springs on a vehicle or a trailer, whether they are metal or in the case of an AS rubber rods, only resist movement in the direction of travel away from the center point. It is a variable rate as well. As the travel gets further from the center it resists more. Basically the spring is storing energy. Once the travel reaches its maximum high or low and begins to return to center the spring releases the stored energy and is still applying force trying to reach center. Unfortunately the spring cannot account for the momentum of the moving parts and over shoots center. Think of a pendulum swinging back and forth until it finally stops. The wheel and tire are the pendulum and gravity is the spring. This creates a cycle of constantly overshooting center and results in vibration, poor tire to road contact, and wear and tear on the trailer itself. Unlike the pendulum example where it finally stops because there is no more energy input, the bumps on the road provide a constant energy input into the system and the vibration only gets worse.

When you introduce a shock into that situation, the shock resists movement when the tire is traveling away from center and also as it is returning to center helping to prevent the tire from overshooting center. In the most basic explanation it dissipates the energy input from the bumpy road and stored in the compressed or stretched spring by converting the energy into heat as the fluid flows through the valve.

The argument against shocks is that the rubber rods naturally dissipate the energy better than a metal spring does. While this is somewhat true it can't dissipate all of the energy or else the spring would never return to center. It still overshoots center. Just not as bad as with a metal spring.

From the tow vehicle you may not notice a ride quality difference with or without shocks. But when it comes to an emergency stop on a bumpy road my bet is on having shocks to dissipate the energy of the bumps and keeping my trailer tires in full contact with the road so they can brake properly and maintain traction.
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Old 11-11-2015, 04:43 PM   #17
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Quote:
Originally Posted by Cardinal283 View Post
Just to clarify the physics behind the argument for shocks. Shocks are a dampener. That's it. That's all they do. The tow vehicle you may not notice a ride quality difference with or without shocks. But when it comes to an emergency stop on a bumpy road my bet is on having shocks to dissipate the energy of the bumps and keeping my trailer tires in full contact with the road so they can brake properly and maintain traction.


Andy
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Old 11-11-2015, 05:45 PM   #18
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Alright were almost there.

I very much appreciate all the excellent info but basically still have the question.

If I buy them locally (as many claim you can) what to ask for for a 65 24' double axle.

Andy advises to go with Airstreams, taking note of that based on vast experience, just not sure I still have time for shipping.
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Old 11-11-2015, 06:17 PM   #19
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We've gone through this before - in my case 9 years ago! - but it doesn't hurt to repeat it.

Having towed my Overlander without shock absorbers, I can assure you that they make a positive difference. Side to side rocking and as sense of floating over bumps and dips disappeared when the new shocks were installed. The trailer wasn't out of control before, but it's much more "buttoned down" now.

I used the Airstream units from Gabriel. They are reasonably priced, and seem to last a good long time.
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Old 11-12-2015, 10:28 AM   #20
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So we have some calls out for further opinion on the Shocks. While waiting for replies I spoke to a OEM dealer of the Shocks that was recommended here. Talked to parts and service department.

Service was very informative and although the sell and install them they told me they (Shocks) WERE NOT needed. That led to a whole conversation about "why not" some if which went over my head.

If my new Axles don't have a bracket or plate pre welded on the inner rubber rods in the tubes can actually be damaged from the exposure to the heat from welding. (I'm sure I messed that explanation up a bit)

Just when you think its decided.
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Old 11-12-2015, 11:26 AM   #21
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If you get your axle from Colin Hyde there is no welding of shock mounts. They come complete. He will also advise you on which shock to get. Mine were Monroe's that I ordered locally and had in a day or so.
Yes vertical mount.
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Old 11-12-2015, 01:00 PM   #22
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Thank you Dingo, went to see the Axles and yes a plate is already there.
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Old 11-12-2015, 04:12 PM   #23
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And the answer (for us) is:

Monroe Gas Magnum Shocks part # 555003 ordered from Amazon.

Thanks to all that responded.

Only my 2nd ever Amazon order, likely shouldn't admit that but I was not able to find them locally.
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