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Reducing push/pull from tractor trailers passing


brooksrimes
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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

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On 1/1/2022 at 4:21 PM, brooksrimes said:

We have a 2021 Jayco Greyhawk 29MV class C.

I believe that would be on the E450 chassis?  With a 14500# GVWR I am wondering if you have weighed it yet and in particular know the weights of each side? An over load or off balance weight can cause problems in handling. 

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You cannot eliminate the push pull from a passing truck.  And you will only get the maximum benefit from the rear anti-roll bar unless you also upgrade the front antiroll bar as well.  The best improvements I got on m E-450 chassis was larger and heavier front and rear anti-roll bars with urethane bushings.  I also changed to heavy duty Bilstein shocks on the front and rear.  Once you get the suspension upgrades done, weight the RV and adjust tire pressures to match the load when it is fully loaded for normal travel.  Also while loaded, get the front-end alignment checked by a truck alignment specialist (not a Ford shop).

Ken

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For me, getting a 4-corner weight then balancing the load made a difference. I was in a conversion van with no passenger so I had to move tools and canned goods into the passenger seat area. I would never had considered that without the weighing at Rainbow's End.

Linda

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23 hours ago, Kirk W said:

I believe that would be on the E450 chassis?  With a 14500# GVWR I am wondering if you have weighed it yet and in particular know the weights of each side? An over load or off balance weight can cause problems in handling. 

Also, getting a front-end alignment, if that hasn't already been done.  I'd do these two things first before spending the money on additional equipment.

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You can't eliminate the push-pull, it's inherent in the long rear overhang on many RVs, especially Class Cs.  As the bow wave from a passing truck passes by it hits the rear of the body first, causing to pivot around the rear axle and pushing the front of the RV towards the truck.  Then it progresses forward, pushing the front end away from the truck - classic push-pull.

I had a Damon Intruder 35' gas Class A that tracked like it was on rails.  No special gimmicks needed - just a wheelbase that was about 15% longer than most RVs, with the accompanying reduction in the rear overhang.  When hit by a side wind or passing truck it leaned smoothly and predictably away from the blast - no push-pull, back and forth movements.

Edited by Lou Schneider
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13 hours ago, brooksrimes said:

I've been thinking about an alignment.  🙂

As I have previously noted, for a proper alignment, load the RV as for normal travel and then go to a truck alignment shop.  The typical Ford shop does not know how to properly align the E450 chassis.

Ken

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