Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-02-2011, 11:05 AM   #1
1 Rivet Member
 
2011 16' Sport
Garfield Heights , Ohio
Join Date: May 2011
Posts: 11
Tundra suspension issue

We purchased a 2011 16 Sport in May and are towing with a 02 Tundra SR5 Ext Cab 4.7L. Our previous SOB folding trailer was a single axle, but the hitch ball to axle measurement was much longer than the new Bambi. The truck has a set of Timbren SES rubber springs installed with a 1" gap (unloaded) per recommendation from Timbren. I originally also used a Valley WD hitch with 550lb bars. The SOB towed fine with this set-up. Later on I installed a set of Bilstein shocks in the rear. These shocks seem to have a much quicker rebound than the OEM's did. I then tried towing the SOB without the WD hitch. Everything was good. Now to the new set-up. I am using a ball mount with a 4" drop, no WD. The truck sags about 2" when I hitch up. Trailer is level but bounces excessively (porpoising) when riding on less than smooth pavement (slow and fast speeds). I have now installed an additional spacer for the Timbrens (no gap when unloaded). This added stiffness helps somewhat but I'm concerned about trailer frame stress. Is the porpoising just an inherant problem with short trailers? Would a WD set up deal with this issue better than the Timbrens? How and why? Trailer sway has been minimal with the Bambi but if a WD hitch will solve the problem, I would probably add SC too. Any light shed on these issues would sure be welcomed. Oh! We love the trailer otherwise!!!
__________________

__________________
Sportcenter is offline   Reply With Quote
Old 07-02-2011, 11:46 AM   #2
tpi
Rivet Master
 
2005 25' Safari
Trabuco Canyon , California
Join Date: Apr 2006
Posts: 866
Images: 2
If the porpoising feels like its pivoting at the hitch ball, I'd sure give WD a try. I think your biggest chance of success lies there.

I've pulled a lot of shorter trailers and haven't noticed an inherent tendency to porpoise. But I've sure seen tow vehicle/trailer combos that did and it can be quite a battle with no guarantee of success.
__________________

__________________
tpi is offline   Reply With Quote
Old 07-02-2011, 01:42 PM   #3
Rivet Master
 
1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
Join Date: Oct 2010
Posts: 2,164
Blog Entries: 1
I am no expert, but I think the WD hitch is exactly what you need. And maybe try taking the Tmbren's off to soften it up a little. I doubt if a Bambi has a whole lot of hitch weight. Maybe you need the extra springs if you carry a lot of weight? I use and like the Reese straight line hitch with the dual cam sway control. Do not much like the friction add on sway devices. And maybe look at how the trailer is loaded. More tongue weight and less weight behind the wheels is good.
__________________
Bill M. is offline   Reply With Quote
Old 07-02-2011, 02:32 PM   #4
Rivet Master
 
SteveH's Avatar
 
2005 39' Land Yacht 390 XL 396
Common Sense , Texas
Join Date: Sep 2007
Posts: 5,311
Unless you have a tow vehicle with the rear suspension of a Sherman tank, all trailers will "propois" without a properly setup weight distribution hitch. The sway control will be essential to you some day also, but without it, the day will be a suprise.
__________________
Regards,
Steve
SteveH is offline   Reply With Quote
Old 07-02-2011, 03:26 PM   #5
CLOUDSPLITTER "Tahawas"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 11,153
Images: 1
Thumbs up Welcome Aboard....

As others have already said...WD hitch with sway control and de-bag the bags when towing.(min pressure).

AS like soft (relative) TV suspension. Have you weighed yet, sounds like you need weight on the steering axle.
__________________
PFC.....

“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
RLC
ROBERT CROSS is offline   Reply With Quote
Old 07-02-2011, 08:44 PM   #6
1 Rivet Member
 
2011 16' Sport
Garfield Heights , Ohio
Join Date: May 2011
Posts: 11
More thoughts and info

Thanks for the replies, but after posting my original thread, I thought about the following. My TV overhang ratio is over 45% (rear axle to hitch ball distance-divided by wheelbase). Not too good. The Bambi's overhang ratio is over 52% (axle to rear of trailer-divided by axle to hitch ball socket). I mention this because my previous trailer had a much lower overhang ratio and it did not porpoise nearly as much as our Sport 16. The TV was set up the same, that is with the Timbren SES (1" gap unloaded) no WD hitch. The Timbren springs are not airbags, but hollow progressive rubber. They take progressively more weight to compress them further. The only user adjustment is to move them closer or farther from the bump stop plates on the TV. As I said earlier, I have now spaced them so they are touching the stops unloaded. I can stand on the rear bumper and bounce up and down and initiate quite a lot of movement in the suspension, so it is not unreasonably stiff. (I'm only 150lbs.) The only theory I have is that a WD set up will stiffen the "flexing point" at the hitch ball rather than just limiting the movement of the ball by stiffening at the rear axle. Does this make sense? I hate to invest in WD if it doesn't solve the problem. Any towing/suspension EXPERTS out there?
__________________
Sportcenter is offline   Reply With Quote
Old 07-02-2011, 09:34 PM   #7
CLOUDSPLITTER "Tahawas"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 11,153
Images: 1
When you drop the tongue on the ball you are unloading the steering axle, the purpose of the WD is to transfer some of that weight back. Have you weighed the rig yet, be good to know the tongue weight.


If properly set up it will not "stiffen" the rear suspension.

I get about the same bounce whether hitched or not.
__________________

__________________
PFC.....

“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
RLC
ROBERT CROSS 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
Tundra Tow vehicle tires wlanford Tires 25 07-10-2016 12:53 PM
Back-up Lights - TV - issue Pinchy Lights - Interior & Exterior 3 05-10-2011 07:24 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:59 AM.


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.