Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-28-2020, 01:29 PM   #1
Rivet Master
 
RivetED's Avatar
 
2019 25' Flying Cloud
Airstream - Other
Airstream - Other
North Central Texas , USA
Join Date: Jan 2004
Posts: 1,001
Rear Sway Bar for Tow Vehicle, not Hitch

My TV is a Chevy 2500 HD (Duramax/Allison) off-road 4x4 (Z71). It does not have a factory rear sway bar. I do have a 40 gal aux. fuel tank plus all my camping gear in the ARE covered bed. MY weights are all within spec but at times I can feel the body 'roll' somewhat.

My question is about adding an after-market (Hellwig?) rear sway bar and what you think I'll gain (or lose-besides the cost) by doing so.

Have you added one after-market for a little more TV stability or did one come with your TV? What do you think?

I'm looking for some input to help me decide if this something I want to do.
RivetED is offline   Reply With Quote
Old 08-28-2020, 02:37 PM   #2
3 Rivet Member
 
2007 25' Safari
Rogers , AR
Join Date: Jun 2019
Posts: 180
I've added rear swaybars to multiple pickups and always loved the way they handle. I have not yet added one to my 2500 Duramax...yet. I also plan to off-road this truck some and swaybars do not aid with suspension flex. On-the-road manners are much improved though.
__________________
2007 Airstream 25FB Safari LS - GY Endurance Prodigy Wireless - Andersen
2005 Chevy Silverado Crew Cab 2500HD Duramax Allison
2008 Porsche Cayenne Turbo 500hp/516lb-ft
2014 Porsche Cayenne Turbo S 550hp/553tq
2005 GMC Sierra Crew Cab 5.3L built 4L60e, 40k Tru-cool
Mr. Merk is offline   Reply With Quote
Old 08-28-2020, 04:02 PM   #3
Rivet Master
 
CBWELL's Avatar
 
1994 34' Excella
Warren , Manitoba
Join Date: Apr 2006
Posts: 963
I pull with a 2012 GMC Duramax Z71,and have never felt the need for a rear sway bar. A good, correctly set up hitch system, is much more importand in my opinion. If you feel like spending cash, Bilstein shocks are a very good investment.
__________________
ACI #7394
2012 GMC 2500 HD Duramax Denali
1994 Excella 34' 1987 Limited 34'
1976 31', 1976 Argosy 22' Gone to new homes
Hensley Hitch
CBWELL is offline   Reply With Quote
Old 08-28-2020, 11:39 PM   #4
4 Rivet Member
 
Collyn's Avatar
 
Church Point , NSW
Join Date: Jul 2013
Posts: 260
Quote:
Originally Posted by RivetED View Post
My TV is a Chevy 2500 HD (Duramax/Allison) off-road 4x4 (Z71). It does not have a factory rear sway bar. I do have a 40 gal aux. fuel tank plus all my camping gear in the ARE covered bed. MY weights are all within spec but at times I can feel the body 'roll' somewhat.

My question is about adding an after-market (Hellwig?) rear sway bar and what you think I'll gain (or lose-besides the cost) by doing so.

Have you added one after-market for a little more TV stability or did one come with your TV? What do you think?

I'm looking for some input to help me decide if this something I want to do.
The problem with a sway bar at the rear end alone is that doing so results in the roll couple (i.e. resistance to roll) being increased at the rear. This will result in the rear tyres taking more load. It is thus necessary to increase their tyre pressure by about 10-15%.

Collyn
__________________
The problem is not so much what people do not know, it's what they think they know that simply is not true.
Collyn is offline   Reply With Quote
Old 08-29-2020, 09:55 AM   #5
New Member
 
Currently Looking...
Geneva , IL
Join Date: Jul 2020
Posts: 3
You will be really thrilled with the Hellwig and super easy install
Dustybird is offline   Reply With Quote
Old 08-29-2020, 11:16 AM   #6
2 Rivet Member
 
Currently Looking...
Boise , Idaho
Join Date: Oct 2019
Posts: 62
Timbren bottom out bumpers might be an option
mtbmitch is offline   Reply With Quote
Old 08-29-2020, 11:34 AM   #7
Rivet Master
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 3,477
As Collyn indicates, adding a sway bar to a tow vehicle may be a mixed blessing. Consider this, the vehicle manufacturers are not leaving off a rear sway bar on heavy haulers to save money, they do it to increase safe and stable towing capacity. So if your trailer weight is well below towing capacity, a sway bar will improve feel and comfort and is worth considering. If you are near capacity, Collyn's warning is worth heeding as the sway bar could cause your vehicle to cross over into oversteer.

Food for thought.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 08-29-2020, 11:43 AM   #8
2 Rivet Member
 
RobH41's Avatar
 
2016 25' Flying Cloud
1978 Argosy Minuet 6.0 Metre
Currently Looking...
Nashville , Tennessee
Join Date: Jun 2016
Posts: 46
My Duramax did much better with new very good aftermarket adjustable shocks...either towing or not. Might be all you need.
__________________
2016 Flying Cloud 25 FB with stern mounted Fiammia Bike rack. TV is 2006 LBZ GMC 2500HD with Gale Banks Engineering engine package. 40 gallon Aux. diesel tank. Front maneuvering hitch. Rancho XL shocks. WBCCI 5173
RobH41 is offline   Reply With Quote
Old 08-29-2020, 01:52 PM   #9
:SPACE A" S/O 11 Air19745
 
guskmg's Avatar
 
2006 34' Classic S/O
Fort Worth , Texas
Join Date: Feb 2007
Posts: 1,591
Full air ride such as Kelderman will eliminate the rolling tendency and the dipping tendency when braking. I have had mine for 12 seasons and would not leave home without it.
guskmg
guskmg is offline   Reply With Quote
Old 08-29-2020, 02:44 PM   #10
3 Rivet Member
 
Spaggs's Avatar
 
Currently Looking...
GAINESVILLE , GA
Join Date: Jul 2019
Posts: 124
I have front and rear sway bars from Hellwig. My Excursion came with a front bar, but Hellwig offers a slightly larger one than OEM. After installing both sway bars, Bilstein 4600 shocks, I've got the 4x4 rear shocks for my 2 1/2" rear lift, and a nifty device called the Roadmaster Active Suspension (RAS) the big SUV handles much better. I help instruct a course called Street Survival (StreetSurvival.org) which helps teenagers practice emergency maneuvers in a safe environment. One time, recently, one of the instructors who set up the autocross course section told me that he might have set it up too tight. So, I thought, why not. I blasted around the course with the Ex and didn't touch a cone.
Sway bars are the best thing you can do to your suspension and not have any effect on ride comfort.
Spaggs is offline   Reply With Quote
Old 08-29-2020, 04:05 PM   #11
Rivet Master
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 3,477
Remember though this is a trailer towing site and your experience does not provide any information about how addition of a sway bar affects towing stability.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 08-29-2020, 08:17 PM   #12
4 Rivet Member
 
Collyn's Avatar
 
Church Point , NSW
Join Date: Jul 2013
Posts: 260
Quote:
Originally Posted by RobH41 View Post
My Duramax did much better with new very good aftermarket adjustable shocks...either towing or not. Might be all you need.
This a far better solution as it will only marginally affect the fore/aft roll resistance ratio that is major factor in oversteer/understeer.

Brian

Tow vehicle roll causes the tow hitch to move laterally - thus introducing trailer sway.

Collyn
__________________
The problem is not so much what people do not know, it's what they think they know that simply is not true.
Collyn is offline   Reply With Quote
Old 08-30-2020, 02:03 PM   #13
3 Rivet Member
 
Spaggs's Avatar
 
Currently Looking...
GAINESVILLE , GA
Join Date: Jul 2019
Posts: 124
Quote:
Originally Posted by BayouBiker View Post
Remember though this is a trailer towing site and your experience does not provide any information about how addition of a sway bar affects towing stability.
I'm sorry. I thought I was on the IMSA racing forum.
Let me try to better explain what I was trying to convey.
Stability is stability. Whether you are towing an Airstream or carving corners on your favorite winding road. It is the same principle. Side to side movement in excess, in any case, is not a good thing. I also changed all of the rubber frame-to-body, suspension and steering bushings to polyurethane, which are other modifications I implemented to help stiffen up the chassis. An exchange of any worn out rubber bushing for a new polyurethane one will help in reducing sway. With the increased roll stiffness, your tow vehicle (TV) will also give you more input as to its connection with the asphalt, meaning your balance receptors in your brain will give you more data about your tire/asphalt connection.
Trailer towing analogy: a semi passes by you at a high rate of speed and nearly sideswipes you. At this moment, I will be driving a vehicle that has every tool in the bag to make this a non-event. On the other hand, if I had a TV with worn shocks, rubber bushings and no sway bars, I might have cause for worry, with good reason.
I hope this better explains what I was trying to say.
Spaggs is offline   Reply With Quote
Old 08-30-2020, 07:31 PM   #14
Rivet Master
 
2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 3,477
The dynamics of towing is complicated. Some adjustments that improve tow vehicle cornering when not towing can degrade safe and stable towing depending on the vehicle and trailer. Addition of a rear sway bar is one example. The effects are generally greater when towing near the vehicle's capacity, so if your trailer is light, adding a rear sway bar won't affect towing stability much.

I completely agree that worn shocks and bushings are cause to worry. A front sway bar is also a good idea. A rear sway bar when towing can be a mixed blessing for the reasons previously mentioned in this thread.
__________________
Brian
BayouBiker is offline   Reply With Quote
Old 08-30-2020, 07:55 PM   #15
4 Rivet Member
 
Collyn's Avatar
 
Church Point , NSW
Join Date: Jul 2013
Posts: 260
Quote:
Originally Posted by BayouBiker View Post
The dynamics of towing is complicated. Some adjustments that improve tow vehicle cornering when not towing can degrade safe and stable towing depending on the vehicle and trailer. Addition of a rear sway bar is one example. The effects are generally greater when towing near the vehicle's capacity, so if your trailer is light, adding a rear sway bar won't affect towing stability much.

I completely agree that worn shocks and bushings are cause to worry. A front sway bar is also a good idea. A rear sway bar when towing can be a mixed blessing for the reasons previously mentioned in this thread.
"Complicated"

Now there's an understatement!

I have in my many decades of workinng and publishing in this area identified 27 mostly inter-depending variables. I've probably missed a few.

Mathematically it (for me at least) it is close to impossible. It involves Lagrangian-Hamiltonian double differential equations.

I tend to think conceptually and find this is the best to go. I did however, when working at Vauxhall/Bedford Research develop a 48-channel analogue computer that really did help.

So to does Newton's Laws of Motion (yet some clown on another posted that Newton's stuff is just an opinion - the poster was a plumber).

I do however feel I have a reasonable overview (as I suspect has Brian). For (academic) authorities its hard to go past Richard Klein and Henry Szostak and Prof Jos Darling.

Collyn
__________________
The problem is not so much what people do not know, it's what they think they know that simply is not true.
Collyn is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anti-Sway Bar or WD with Anti-Sway for 19' FC? CanonFan Towing, Tow Vehicles & Hitches 32 09-20-2016 05:29 AM
Which is better? A sway control hitch or a vehicle with sway-control? Lucky Strike Tow Vehicles 27 08-13-2015 05:34 AM
Demco Excali-Bar tow bar Denis4x4 Airstream Classifieds 0 05-03-2015 01:39 PM
62 safari hitch and sway bar hook up mmenchel Hitches, Couplers & Balls 3 12-15-2010 03:59 PM
Torsion Bar vs Sway Bar acrane Hitches, Couplers & Balls 9 07-31-2006 06:11 AM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 03:08 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.