Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-25-2016, 01:32 PM   #1
New Member
 
Everett , Washington
Join Date: Apr 2016
Posts: 3
Bouncing down concrete freeways

We have a 2013 20' Flying Cloud towing with a 2006 Dodge Dakota 4X4 w/4.7 v8 & Equalizer hitch. We have towed on sections of I-90 that are concrete panels with expansion joints. On some section there is a terrible bouncing setup between 50 - 65 mph. Once it start oscillating the only way to eliminate the rough ride is to slow to to less than 50 mph. After the first jouncing experience, I installed new upgraded rear shocks and adjusted the hitch to transfer more weight to the front of the truck. I didn't weigh the rig but the setup is level and tows well except on concrete road surfaces. FC Mike
__________________

__________________
FC Mike is offline   Reply With Quote
Old 06-01-2016, 12:22 PM   #2
2 Rivet Member
 
2012 25' FB Eddie Bauer
2009 19' International
Aptos , California
Join Date: Feb 2010
Posts: 94
Images: 1
I ran into this problem on I90 in Seattle. It was so unsettling that I now detour to avoid it.
__________________

__________________
brad1 is offline   Reply With Quote
Old 06-01-2016, 01:52 PM   #3
Rivet Master
 
dznf0g's Avatar

 
2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
Posts: 9,408
Images: 5
Sometimes LESS WD will help.....different with every rig. Also more TW will help. Do you know all your detailed weights?
__________________
-Rich-

"If the women don't find you handsome, they should at least find you handy." - Red Green
dznf0g is offline   Reply With Quote
Old 06-01-2016, 02:05 PM   #4
Rivet Master
 
2014 20' Flying Cloud
Long Island , New York
Join Date: Jun 2015
Posts: 6,359
Welcome to the forum, Mike!

By adjusting the WD to increase the weight on the front axle of the truck, you have also thrown some of the weight to the rear of the single-axle trailer IMO, in effect putting more weight further away from the center of gravity of your rig. As Rich said, you might consider dialing the WD down. When we got our FC20 the dealer's shop foreman, very experienced with Airstreams, told us we could tow just fine without any WD. But we do use a basic Reese with 800-pound bars set fairly light.

Single-axle trailers tend to hobby-horse more easily IMO, so getting the weight distribution just right is important. As also suggested you might want to weigh your rig carefully, as the fresh water tank in the very rear can be a heavy pendulum-like "moment" very far away from the center of gravity, another possible factor here.

BTW did you know there is a thread here for our 20-footers? We have unique issues to deal with, and the community there is very helpful, including Safari 20' owners with lots of AS experience.

http://www.airforums.com/forums/f516...rs-127845.html

Good luck!

Peter


Quote:
Originally Posted by FC Mike View Post
We have a 2013 20' Flying Cloud towing with a 2006 Dodge Dakota 4X4 w/4.7 v8 & Equalizer hitch. We have towed on sections of I-90 that are concrete panels with expansion joints. On some section there is a terrible bouncing setup between 50 - 65 mph. Once it start oscillating the only way to eliminate the rough ride is to slow to to less than 50 mph. After the first jouncing experience, I installed new upgraded rear shocks and adjusted the hitch to transfer more weight to the front of the truck. I didn't weigh the rig but the setup is level and tows well except on concrete road surfaces. FC Mike
Quote:
Originally Posted by dznf0g View Post
Sometimes LESS WD will help.....different with every rig. Also more TW will help. Do you know all your detailed weights?
__________________
OTRA15 is offline   Reply With Quote
Old 06-01-2016, 02:58 PM   #5
Rivet Master
 
Ray Eklund's Avatar

 
2014 25' International
2006 23' Safari SE
Currently Looking...
Boulder City , Nevada
Join Date: Aug 2007
Posts: 2,367
Were your Black, Grey and Fresh water tanks full, evenly divided or empty?

Although friends had a 25 foot Arctic Fox, their Black & Grey water tanks needed to be emptied. The front end of his 2000 Tundra was hopping down the asphalt in Wyoming, when catching the dips in the asphalt. His steering was impaired in the process of undulating...

Sounds like you already have the 'hitch cure', but your water situation was not brought up as an additional item to keep in mind.
__________________
Human Bean
Ray Eklund is offline   Reply With Quote
Old 06-02-2016, 09:32 AM   #6
BAB
Rivet Master
 
BAB's Avatar

 
2015 30' Classic
2012 28' International
Greensboro , North Carolina
Join Date: Aug 2011
Posts: 1,574
Have had the same experience with both Airstreams. It IS very unnerving when this rhythm gets going and I've tried to lessen the effect by speed changes, adjusting weight distribution, you name it. It is a PITA, but fortunately goes away when you get away from the too-high expansion joints.
__________________
_________________
"SilverLeaf II" 2015 30' Classic
2014 RAM 2500 Laramie 4x4 CC w/6.7L Cummins
ProPride 3P
AIR# 58452
WBCCI # 3430-Unit 21
BAB is offline   Reply With Quote
Old 06-02-2016, 10:56 AM   #7
Rivet Master
 
J. Morgan's Avatar

 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,046
Images: 11
I have built an opinion that a lot of people tighten their weight bars too much.


Superat stultitia.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 06-03-2016, 05:19 AM   #8
Rivet Master
 
2014 20' Flying Cloud
Long Island , New York
Join Date: Jun 2015
Posts: 6,359
Quote:
Originally Posted by J. Morgan View Post
I have built an opinion that a lot of people tighten their weight bars too much.


Superat stultitia.
Especially with single-axle trailers with lighter tongue weights IMO, where one of the main purposes of WD is to dampen the hobby horsing caused by harmonic oscillations due to the pavement expansion joints at certain speeds.

Actually to be more accurate probably, it is not the individual joints which are the problem, but the fact that each joint separates two flat planes which are not exactly co-planar. In other words, as you move from one FLAT section of pavement, across the expansion joint, you actually cross onto the next FLAT section of pavement which is at a slightly different angle, relative to the first.

Only slightly different, yes, but different nonetheless. Combine multiple crossing events like this at just the right speed, and the harmonics reinforce each other, including the actions/reactions of the shock absorbers and springs on BOTH the tow vehicle and trailer.

Like a big Rube Goldberg device!

__________________
OTRA15 is offline   Reply With Quote
Old 06-04-2016, 03:43 AM   #9
Vintage Kin
 
slowmover's Avatar
 
Fort Worth , Texas
Join Date: Nov 2006
Posts: 7,598
Images: 1
Bouncing down concrete freeways

Quote:
Originally Posted by J. Morgan View Post
I have built an opinion that a lot of people tighten their weight bars too much.


Superat stultitia.

Thus the point of experimenting with different settings (scale readings). Any given rig will have a fairly narrow possible range. Once known it's far easier to work within that range to ameliorate the problem.

Same for TV tire pressure range. Won't know until verified and tested. My bias is that most run the road towing with improper TV tire pressure.
__________________
1990 35' Silver Streak Sterling; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 9-cpm solo, 15-cpm towing
Sold: Silver Streak Model 3411
slowmover is offline   Reply With Quote
Old 06-04-2016, 03:53 AM   #10
4 Rivet Member
 
1991 25' Excella
Stanfield , Oregon
Join Date: May 2016
Posts: 317
What you dont want to see is the unnecessary amount of stress being applied to your trailer while this is going on. Yet people keep cranking there wd hitchs way too tight.
__________________
SpletKay06 is offline   Reply With Quote
Old 06-04-2016, 08:21 AM   #11
Rivet Master
 
J. Morgan's Avatar

 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,046
Images: 11
I don't exactly remember the "right" way to adjust the weight bars, but having done it that way a couple a few times only to pull over and loosen the bars a few miles in, now days I shoot to tighten the jacks to the place that my combination feels, rides, and drives best.

For me and my combination this is with the bars a lot looser than doing it "by the book" would indicate.




Superat stultitia.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 06-04-2016, 10:16 AM   #12
Rivet Master
 
dkottum's Avatar
 
2012 25' Flying Cloud
Battle Lake , Minnesota
Join Date: Jun 2009
Posts: 7,716
Have had some rough experiences on those concrete segments, we have even pulled off to another out-of -the-way route. We had a 2006 Tundra and 20' FC with Equal-I-Zer hitch, our first Airstream and it had the worst setup for ride.

We have experimented and learned some things. Now with our tandem axle Airstream, half-ton pickup (front and rear axles same weight rating) and tapered round w.d. bars we get a good ride by setting them so the load on each truck axle is close to equal.

A large part of it is loading, we try to keep our Airstream loads with heavy gear (and full water tank) over the axles. I believe this reduces the amount of rocking motion. We load the truck similar way, heavy gear forward in the bed (or rear seat area), and very light behind its axle.
__________________

__________________
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles

The Truth is More Important Than the Facts
dkottum 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
Goin' down, down, down... Aironius Axles 12 08-23-2014 09:09 AM
Driving LA Freeways! Turtle On The Road... 37 09-16-2008 11:36 AM
L.A. Freeways safari 28 Hitches, Couplers & Balls 18 01-24-2008 01:22 AM
Rough ride on some concrete freeways MNM Member Introductions 26 04-01-2006 08:48 AM
Bouncing Bubble smallfry On The Road... 4 03-11-2003 07:54 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:57 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.