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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > Reducing push/pull from tractor trailers passing

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brooksrimes

Sioux Falls, SD

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Posted: 01/01/22 03:30pm Link  |  Quote  |  Print  |  Notify Moderator

We have a 2021 Jayco Greyhawk 29MV, class C.

Attached are links for a Hellwig 7180 rear sway bar, a Supersteer SS451 rear trac bar and rear Sumo springs SSR-130-54. Which would have the greatest benefit in reducing the push/pull from large tractor trailers passing us on the interstates?

https://www.hellwigproducts.com/products/search-by-vehicle/?Year1=2021&Make=Ford&Model=E-450+Super+Duty

https://supersteerparts.com/products/supersteer-ss451-rear-trac-bar-for-ford-e450-2021-v8.html

https://supersteerparts.com/products/rear-sumosprings-solo-kit-for-ford-e350-e450-ssr-130-54.html

pianotuna

Regina, SK, Canada

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Posted: 01/01/22 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

Hi,

I used air tabs.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

IAMICHABOD

Sunny So Cal

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Posted: 01/01/22 05:10pm Link  |  Quote  |  Print  |  Notify Moderator

When an 18-wheeler overtakes your RV, it's bow-wave of air hits the left rear of the coach first, and that pushes the rear toward the shoulder. When the body rear moves right slightly before the rear axle does, it amplifies the push to the left that you feel in the front causing you to correct by steering to the right.

As the 18-wheeler bow wave moves toward the front of the coach, it pushes the front of the coach to the right, and when the body moves right slightly before the front axle does, it amplifies the steering correction you have already done causing you to have to correct to the left.

This whole thing, if you are not used to the feelings, can be quite scary. One way to overcome that is to install Vortex Generators like Air Tabs They cut down on the dead air and drag on the rear of RV and greatly reduce the bow wave of passing trucks.

I have AIRTABS on my Class C.

They really help on a cross wind situation,no more sudden buffeting. It has stopped the sideways push when being passed or passing a large truck.

They are a vortex generator that produce a counter rotating air trail several feet behind the vehicle, This airflow alteration improves vehicle stability. As far a mileage it may helped some but the stability they provided is amazing.


2006 TIOGA 26Q CHEVY 6.0 WORKHORSE VORTEC
Former El Monte RV Rental

Buying A Rental Class C


Mike134

Elgin, IL

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Posted: 01/01/22 05:41pm Link  |  Quote  |  Print  |  Notify Moderator

If I see him coming in my mirrors (don't always check them) I move a bit right in my lane and that helps a lot. Lowest cost option out there.


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Grit dog

Black Diamond, WA

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Posted: 01/01/22 06:24pm Link  |  Quote  |  Print  |  Notify Moderator

Speed up? How slow are you driving that semis, most of which are governed at something under 70 mph are blowing your doors off?
Other than that, of the 3, the track bar would do the most to help that scenario. (Never knew they made a trac bar for a leaf spring suspension…)
No experience with air tabs but those sound like the best thing if you can’t move over, speed up or don’t need suspension help.


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brooksrimes

Sioux Falls, SD

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Posted: 01/01/22 06:42pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks to all for the suggestion.
Had not heard of Airtabs before.
Will look into it.


Brooks & Brenda
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brooksrimes

Sioux Falls, SD

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Posted: 01/01/22 06:43pm Link  |  Quote  |  Print  |  Notify Moderator

Mike134 wrote:

If I see him coming in my mirrors (don't always check them) I move a bit right in my lane and that helps a lot. Lowest cost option out there.

I try that too. Works better sometimes than others. A lot has to do with how close the trucker comes to you and how much faster is he going than you.

bobndot

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Posted: 01/01/22 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

Caster is important on new units. This is older info but still stands.

Alignment info class C. Check caster numbers.

navegator

San Diego CA.

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Posted: 01/02/22 08:00am Link  |  Quote  |  Print  |  Notify Moderator

If the RV has the air tabs, what is the effect on a towed vehicle in the generated votex, does the toad swerve constantly or does it track true?

Or does the toad venicle need to have the yabs also to mitigate the vortex generated by the RV?

navegator

pianotuna

Regina, SK, Canada

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Posted: 01/02/22 09:44am Link  |  Quote  |  Print  |  Notify Moderator

navegator,

I can't answer as I have only towed a utility trailer. So far as I am aware there was no swerving.

* This post was edited 01/02/22 10:03am by pianotuna *

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