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Open Roads Forum  >  Towing

 > 5th Wheel Porpusing

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jch88_1

Irving, TX

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Posted: 07/12/12 06:34am Link  |  Print  |  Notify Moderator

I have 09 Chevy 2500 HD ext cab with 6.0 litre, 3.73 rear end, std bed. I pull a 30ft Rockwood Signature Ultra-lite rated at 78oo lbs with rear kitchen.

My problem is porpusing when traviling at reg speeds and the seams in the roads cause the trailer to porpuse(bounce) up and down starting in the rear, it acts similar to a seesaw.

Is it poosible the balance of the trailer is off, too light wt of the truck?

Has anyone experienced this before and was there a fix action that resolved the issue.

JCH88_1.

Dick_B

Palos Heights, IL USA

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Posted: 07/12/12 06:47am Link  |  Print  |  Notify Moderator

Does this happen on asphalt roads or just on concrete roads with the joints evenly spread?
We have the same problem with our TT on some concrete roads. You might try varying the speed in case there is a sympathetic vibration in the RV that just matches the joint spacing at certain speeds.
It's a radical idea but I wish the concrete road builders would stagger the joints.


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donn0128

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Posted: 07/12/12 06:54am Link  |  Print  |  Notify Moderator

Load up like your going camping Nd go to the scales. Get some good weights. Then dr the trailer and weight the truck itself. Guesses are just that. Accurate weights will tell the story.


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netaq

Atlanta, GA

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Posted: 07/12/12 07:34am Link  |  Print  |  Notify Moderator

Do you run stock shocks? If your weights are all proper, <$350 for a set of decent shocks (such as bilstein 5100) would definitely help.


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RCMAN46

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Posted: 07/12/12 07:47am Link  |  Print  |  Notify Moderator

donn0128 wrote:

Load up like your going camping Nd go to the scales. Get some good weights. Then dr the trailer and weight the truck itself. Guesses are just that. Accurate weights will tell the story.


X2 getting real world towing weights is easy, cheap and may give the answer you want. I suspect your pin weight is too low. You need following weights with trailer in camping trim. Truck front axle, then both axles on truck, then both axles on truck and front axle of trailer, then all 4 axles. Disconnect the trailer and front axle of truck then both axles of the truck. With these 6 weights you can determine all that is needed to make sure you are good to go.
How level is your trailer in camping trim?

TomG2

Central Illinois

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Posted: 07/12/12 07:58am Link  |  Print  |  Notify Moderator

I had a similar setup and the closer I got the trailer to level, the better it towed. There are some expensive hitch options that promise to help also.

* This post was edited 07/12/12 08:22am by TomG2 *

APT

SE Michigan

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Posted: 07/12/12 10:17am Link  |  Print  |  Notify Moderator

May need better WD hitch adjustment. Start by the forum sticky.


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BarneyS

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Posted: 07/12/12 11:27am Link  |  Print  |  Notify Moderator

APT wrote:

May need better WD hitch adjustment. Start by the forum sticky.

According to his thread title, he has a 5th wheel trailer, no WD involved.
Barney


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APT

SE Michigan

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Posted: 07/12/12 01:51pm Link  |  Print  |  Notify Moderator

Doh. Sell, road speed you can vary. If your truck is anything like my Suburban, the OEM shocks are underdamped brand new. Seems like a good place to start replacing.

Wes Tausend

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Posted: 07/13/12 02:51pm Link  |  Print  |  Notify Moderator

...

My buddy had that problem. He used a small 20 foot 5th wheel and 1/2 ton combo goose-neck set up of which the gooseneck is a bit more prone to springiness, I think.

I thought it was mostly his hitch truck mount. The main hitch frame mount was basically a custom side-to-side 3/8's flat plate under the box, but above the frame rails. I thought it was flexing.

He cured it by a new, bigger 5vr and 3/4 ton truck, so we'll never know for sure. As others have mentioned, new high quality shocks should help, especially on the up/down motion.

The point is... where is is the fore-aft flex coming from, if it too exists? As an example, if a string were taped from the cab to the 5vr front, it would tear loose and/or gain slack during the harmonic motion. Shocks may damp it, but why does this supposedly rigid connection give to start with?

Wes
...


Days spent camping are not subtracted from one's total.
- 2000 Excursion V-10 - 2000 F-250 CC 7.3L V-8
- 2004 Cougar Keystone M-294 RLS, 6140# tare
- Hensley Arrow - Champion 4000w/3500w gen
- Linda, Wes and Quincy the Standard Brown Poodle
...

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