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Open Roads Forum  >  Tow Vehicles

 > Better ride when not towing?

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Gator398

Oklahoma

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Posted: 03/02/21 08:53pm Link  |  Quote  |  Print  |  Notify Moderator

Is it possible, to make a dually truck not shake like an earthquake on expansion joint roads when the trailer is off???!!

I have read about the kelderman 4 link or whatever, is that our only option?


2021 Flagstaff Micro Lite 25BRDS
2011 Ram 3500 DRW Laramie Longhorn 6.7L

MT BOB

Montana

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Posted: 03/02/21 09:51pm Link  |  Quote  |  Print  |  Notify Moderator

Are you 12?

BenK

SF BayArea

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Posted: 03/02/21 10:14pm Link  |  Quote  |  Print  |  Notify Moderator

All things will vibrate from some sort of input. When the input harmonic matches the thing’s natural harmonic and if the input continues to input, the thing will vibrate more within the same frequency.

Your running over the expansion joints sets up an input to your truck. Your speed dictates the frequency of the input to your TV.

Slowing down and/or speeding up will change the input frequency to your truck.

As for you trucks harmonic...the things that are part or contribute to its harmonic are the tires, suspension (shocks, bushing, shocks, architecture, etc), the body bushings to frame and a big ETC.

The Kelderman suspension you mention changes the suspension architecture and the air bags adjust what the input’s amplitude & suspension response...AKA tunes the suspension harmonic

Other than changing your speed, changing the tire PSI changes its harmonics, change the shocks and can go either way...more or less dampening, and everything else in that food chain.

Easiest and lowest cost is changing your speed...


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
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Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
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Beverley&Ken

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Posted: 03/02/21 10:26pm Link  |  Quote  |  Print  |  Notify Moderator

I'm not a truck person, but read your owners manual and/or door sticker for tire pressure, empty and loaded. If they are overinflated for the load they are carrying, you will get the ride you are describing. Best would be to get the truck weighed fully loaded with trailer, front and rear axle plus trailer axles. Then have the truck alone,as your daily driver weighed, again axle weights.
Then use the tire manufacturers chart for your particular tire to see the recommended pressure for each tire/axle. You might get a smoother ride for next o $0.00

Ken


2006 Winnebago Outlook 29B E-450.
2012 Honda CR-V AWD
Blue Ox Aventa LX tow bar and Brake Buddy Vantage.

Grit dog

Black Diamond, WA

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Posted: 03/02/21 10:53pm Link  |  Quote  |  Print  |  Notify Moderator

Concrete roads? Nope, but it should be worse with the trailer on.
Just Rough riding? Lower tire pressure.


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

Groover

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Posted: 03/03/21 05:04am Link  |  Quote  |  Print  |  Notify Moderator

I got a very noticeable ride improvement on my F250 by switching to Rancho 9000 shocks, both empty and loaded. I like being able to adjust these shocks for the load. Others here like Bilstein shocks. I haven't tried them.

Tvov

CT

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Posted: 03/03/21 05:14am Link  |  Quote  |  Print  |  Notify Moderator

MT BOB wrote:

Are you 12?


What does this question relate to?


_________________________________________________________
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2004 21' Forest River Surveyor


eHoefler

ozark mountains

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Posted: 03/03/21 05:56am Link  |  Quote  |  Print  |  Notify Moderator

I reduce my rear tire pressure from 80 psi to 40 psi when I am not towing the fifthwheel


2019 Ram Limited, 3500, Crew Cab, 1000FTPD of Torgue!, Max Tow, Long bed, 4 x 4, Dually,
2006 40' Landmark Mt. Rushmore

wildtoad

Blythewood, SC

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Posted: 03/03/21 06:17am Link  |  Quote  |  Print  |  Notify Moderator

Tvov wrote:

MT BOB wrote:

Are you 12?


What does this question relate to?


MTBOB joined yesterday. I’ve read two of his posts and each one seems to be demeaning to the OP.


Tom Wilds
Blythewood, SC
2016 Newmar Baystar Sport 3004
2015 Jeep Wrangler 2dr HT

rhagfo

Portland, OR

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Posted: 03/03/21 06:44am Link  |  Quote  |  Print  |  Notify Moderator

eHoefler wrote:

I reduce my rear tire pressure from 80 psi to 40 psi when I am not towing the fifthwheel


You do realize that you only need 65 psi in your rear tires on a DRW to get to max axle weight rating of 9,750#.
Even that 40' Landmark is not going to put at max rear axle rating. I have seen them run as low as 35 psi unloaded.


Russ & Paula the Beagle Belle.
2016 Ram Laramie 3500 Aisin DRW 4X4 Long bed.
2005 Copper Canyon 293 FWSLS, 32' GVWR 12,360#

"Visit and Enjoy Oregon State Parks"


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