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

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 11-03-2013, 04:41 PM   #1
Senior Member
larrydp's Avatar
Join Date: Aug 2010
Location: Jackson, MS
Posts: 238
A vs C and wind movement

DW and I have a 31SS JAYCO class C. Are looking for a similar size A. We experience considerable wind movement when 18 wheelers pass us. Do the A's experience the same turbulence?? Thanks!!
Larry, Alice, and Halle (part-time watch dog)
Grayhawk 31 SS
larrydp is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 11-03-2013, 04:57 PM   #2
Senior Member
akeyzoo's Avatar
Join Date: May 2013
Posts: 961
My guess is it has everything to do with mass. Our coach doesn't move much, but I think that is because of weight not length or shape. I would presume if an A or C were of comparable weight they would react similarly to big rigs (talking smaller class A's, I assume air ride/tag axle all help on bigger DP's).
American Revolution 40L CAT C9
Samsung 197, TireMinder, Ready Brute Elite with Wrangler
akeyzoo is offline   Reply With Quote
Old 11-03-2013, 05:02 PM   #3
Senior Member
texnet's Avatar
Monaco Owners Club
Join Date: Apr 2009
Location: Granbury, Texas
Posts: 1,392
The first Class A we had was a 2007 34' Hurricane built on a Ford V10 chassis. We did experience a shift when 18 wheelers passed us. I installed a Safe-T-Plus and that helped a LOT! The second coach we had was a 2006 Coachman 350 diesel pusher on a XC chassis and the coach was much more stable. In our current coach we do not have any movement when an 18 wheeler passes us!!!
Ronnie (WD5GIC) & Jan (WD5IHU)
2003 Monaco Dynasty Countess 42' w/tag, 2012 Ford Flex

texnet is offline   Reply With Quote
Old 11-03-2013, 05:36 PM   #4
Senior Member
Ray,IN's Avatar
Join Date: Aug 2001
Location: North America somewhere
Posts: 23,729
Class A's with tag-axles are more stable than those without. Our 40' MH without tag, moves when overtaken by semis or other MH's. The movement is not unsettling, I've learned how to prepare to be overtaken by another large vehicle, how to react to the bow-wave push, and the draft-effect when almost passed. The movement is totally different, and more than what I experienced in the dually and 40' 5er we used to own.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 11-03-2013, 05:46 PM   #5
Senior Member
CampDaven's Avatar
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,554
Blog Entries: 1
I am about 20K lbs. Very little wind issues. No steering stabilizer. I'm not going to try and figure out why. ;-)
Dave and Nola, RVM1
The Journey is Our Destination!
CampDaven is offline   Reply With Quote
Old 11-03-2013, 05:56 PM   #6
Senior Member
Rich-n-Linda's Avatar
Join Date: Nov 2011
Posts: 884
It has a lot to do with rear end overhang. The more body mass there is BEHIND the rear axle, the less stable the driving experience. 36-foot coaches are especially susceptible to unstable driving conditions because most of them are built on a chassis with a short wheelbase and have a lot of overhang behind the rear axle.

That's why the 40-foot and longer coaches are so much more stable. They are built on a long wheelbase chassis and have a relatively short overhang behind the rear axle, especially if they have a tag axle.
Rich-n-Linda is offline   Reply With Quote
Old 11-03-2013, 06:51 PM   #7
Moderator Emeritus
TXiceman's Avatar

Vintage RV Owners Club
Texas Boomers Club
Oklahoma Boomers Club
Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 20,216
Blog Entries: 21
The class C Ford chassis are woefully short on suspension for the load they have to carry. It can be fixed. You will need to add:
-heavier anti roll bars with urethane bushings on the front and rear
-HD Bilstein shocks on all four corners
-and last possibly add air springs to the front and rear.

This will stop the bump or roll steer tendency of the Ford chassis and make if a pleasure to drive.

But start by weighing the RV with it fully loaded and adjust your tire pressures to match the loads per axle. Then get the alignment set properly at a good independent truck alignment shop...not a Ford shop.

Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
TXiceman is offline   Reply With Quote
Old 11-03-2013, 08:20 PM   #8
Senior Member
Selah's Avatar
Join Date: Oct 2012
Posts: 2,328
Rich mentioned on of the biggest factor on wind push and that is the wheel base compared to over all length. The greater the overhang the more you will feel that push. On gas coaches one thing that help mitigate wind push is to have track bars on both front and rear. Some people also report improvement from steering stabilizers.
Also mentioned is that DP will handle that issue better because of seer weight. My previous Allegro had a 22K chassis, my Phaeton has a 44K chassis. In the Allegro I could feel the push but I didn't think it was bad. In the Phaeton I don't feel it at all.
So, the answer to you question is... It depends!
Paul, Kathy, and Tux the Mini Schnauzer
2014 Tiffin Phaeton 42 LH, 2013 Honda CRV
"When the time comes to look back, make sure you'll like what you see"
Selah is offline   Reply With Quote
Old 11-03-2013, 08:53 PM   #9
Senior Member
njs42's Avatar
National RV Owners Club
Workhorse Chassis Owner
Join Date: Apr 2011
Location: Federal Way, Wa.
Posts: 2,901
We rented a Class C to get us started on RV ownership. We bought a Class A. One of the big differences I noticed right away is the lack of movement when passed by an 18 wheeler in the Class A. This is all relative, of course, an 18 wheeler takes quite a swath through the air but you ask for a comparison and I have driven both and my Class A is much less effected.
I do all my own stunts
03 Dolphin LX 6355, Workhorse W22, 8.1 vortec, 04 CR-V, Blue Ox, Brake Pro----Norm, Barb and
Doc(He's a PhD)
njs42 is offline   Reply With Quote
Old 11-03-2013, 08:58 PM   #10
Senior Member
CampDaven's Avatar
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,554
Blog Entries: 1
I have a W20D chassis with a GVW of 20,500. So it is a bit of a light weight.

The wheelbase is under 51% of OAL, a ratio that is supposed to make it vulnerable to wind and handle poorly. It also has over 12 ft of overhang from rear axel to rear bumper.

It handles wonderful in all aspects. Was I just lucky? Perhaps aerodynamics of the sloped sidewalls and nose? I have no clue.
Dave and Nola, RVM1
The Journey is Our Destination!
CampDaven is offline   Reply With Quote
Old 11-04-2013, 01:00 AM   #11
Senior Member
Dunner's Avatar
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 11,106
This is what some people with the Ford F53 chassis have done to reduce wind push.

And for more info:

2004 32' National Sea Breeze 1311 Class A on a F-53 Chassis, CHF, TST TPMS, 5Star Tune.
If Dunner (RVM23) can't fix it, it ain't broke!
Cheap Handling Fix Poll. Click Here to vote?
Dunner is offline   Reply With Quote
Old 11-07-2013, 09:15 AM   #12
Senior Member
larrydp's Avatar
Join Date: Aug 2010
Location: Jackson, MS
Posts: 238
I appreciate all of y'all's info!!
Larry, Alice, and Halle (part-time watch dog)
Grayhawk 31 SS
larrydp is offline   Reply With Quote
Old 11-07-2013, 09:28 AM   #13
Senior Member
Monaco Owners Club
Holiday Rambler Owners Club
Join Date: Jan 2013
Location: michigan-tip of the mitt
Posts: 1,444
Originally Posted by larrydp View Post
I appreciate all of y'all's info!!
If ya run faster than the semi's you feel none of their wind turbulance.
2003 Class C, 29' Gulfstream
Next stop?
Previous rigs..2 Pickup campers,2 TT's, 3 DP MH's
t55watson is offline   Reply With Quote
Old 11-07-2013, 09:42 AM   #14
Senior Member
Join Date: May 2007
Location: Davie, Florida
Posts: 727
In a word Yes. I assume you are going to keep it a gasser class A and not move all the way up to a diesel pusher. There are some inexpensive things you can do to greatly reduce that effect on a Ford Chassis. First replace the rear sway bar bushings with polyurathane ones you can buy on ebay for $50. Then you must do the Cheap Handling Fix which is nothing more than relocating bolts on the sway bars. You can see actual pictures of this on the thread Dunner mentioned. That was the one most effective thing I did to reduce that side winds and cross winds problems inherent with the Ford Chassis.
Denis, Ruth and Gracie
the K-9 Dashboard Ornament
2007 Newmar Baystar 3202
D in Davie is offline   Reply With Quote

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

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 10:40 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.