Sunline RV Forum
Sunline User Photos

Go Back   Sunline Coach Owner's Club > Technical Forums > Towing and Tow Vehicles
Click Here to Login

Join Sunline Club Forums Today


Reply
 
Thread Tools Search this Thread Display Modes
Old 07-07-2008, 07:09 AM   #1
Junior Member
 
Join Date: Jun 2008
Posts: 8
SUN #633
jabfd32
tires

hello,

i have a 1550 towing with 93 jeep grand cherokee
when iam towing on the highway sometimes on bump or wind it start to sway.any idea why it does this?
i checked my tires they are car tires . i was suppose to have f78x14 but i have p215/75/14 . I found out that f78 is now st205/75/14 could this be my problem?
__________________

__________________
87 t1550
93 jeep grand cherokee
jabfd32 is offline   Reply With Quote
Old 07-07-2008, 08:20 AM   #2
Senior Member
 
Steve Collins's Avatar
 
Join Date: Apr 2007
Location: New York
Posts: 1,846
SUN #264
Steve Collins is an unknown quantity at this point
On a small trailer like your 1550, the exact type of tires probably won't have that much effect on sway. But if they are ready for replacement, you definately want to get ST's. There've already been several threads on this subject in the Towing and Tow Vehicles section. I encourage you to look back and read them.

But in your case, I suspect the cause is a bit simpler and the fix is free. You didn't state what year your T-1550 is, but I looked in 1993's brochure here in the "Files" section to get the GVWR of a 1550. If your model year is different, your GVWR may be a bit different, but the rules are the same and the calculations are the same, and the fix is the same.

You also didn't tell us if you are using a weight distributing hitch or not, and if you already have some kind of anti-sway device on your towing setup.

The most common cause of sway is not enough tongue weight in comparison to the GVWR of the trailer. Because of this, your trailer can be too heavy behind the axle. This can cause sway when you hit a bump or encounter wind conditions. In short, the tail wags the dog.

It's compounded by a short wheel base tow vehicle like your Jeep, but that usually can be fixed by adjusting tongue weight, especially in lighter weight setups like yours.

Tongue weight should be at least 12% of the GVWR, and preferably around 15% to be sure. Much more than that is going to cause a different set of problems. The '93 T-1550 is spec'ed at a GVWR of 2085 pounds. 15% of that is about 312 pounds. Your tongue weight should be right around that. If it is not, the fix is free and easy. Shift some gear around in the trailer to increase the weight on the tongue.

It is also helpful to determine the actual loaded weight of your trailer, as you may have way too much gear in it, but for starters, get the tongue weight up to around 300# or so. If that doesn't stop the sway, then you have a different set of issues to deal with.

If you have a WD hitch, you will compensate for that by taking up another link or two on the chains if the setup sags at the hitch because of the heavier tongue weight. If you don't have a WD hitch, and you get sag at the hitch point, it's probably time to consider upgrading to a WD system.

If adjusting the tongue weight doesn't fix the problem, then it is time to look at an anti-sway device, but the tongue weight is most important, and needs to be fixed first.
__________________

__________________

'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
Steve Collins is offline   Reply With Quote
Old 07-07-2008, 02:54 PM   #3
Junior Member
 
Join Date: Jun 2008
Posts: 8
SUN #633
jabfd32
thank you my sunline is a 87 saturn 1550 i do not have wd or sway control but iam going to way the tounge weight and check that out.
__________________
87 t1550
93 jeep grand cherokee
jabfd32 is offline   Reply With Quote
Old 07-07-2008, 10:53 PM   #4
Senior Member
 
Steve Collins's Avatar
 
Join Date: Apr 2007
Location: New York
Posts: 1,846
SUN #264
Steve Collins is an unknown quantity at this point
Quote:
Originally Posted by jabfd32
thank you my sunline is a 87 saturn 1550 i do not have wd or sway control but iam going to way the tounge weight and check that out.
Your '87 T-1550 is spec'd for a GVWR of 3000 pounds - meaning that your tongue weight should be up around 400 to 450 pounds. That likely puts you as needing WD as that is borderline too much weight for the rear of the Jeep in a towing situation.

And, you really should have trailer brakes as most states require them for anything over 2000 pounds GVWR. Safety for you and the folks who share the highway with you says you should have them anyway.

If you search back a bit, you will find several threads on this exact subject with great detail on the whys and wherefores of all of this.

Sounds to me like someone had a real strong TV, maybe a 3/4 ton PU, and decided they didn't need WD or brakes or sway control. With your Jeep, you almost certainly need at least WD and trailer brakes. Sway control is a decision to be made after the other stuff is fixed, especially the tongue weight.
__________________

'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
Steve Collins is offline   Reply With Quote
Old 07-08-2008, 06:39 AM   #5
Senior Member
 
Steve Collins's Avatar
 
Join Date: Apr 2007
Location: New York
Posts: 1,846
SUN #264
Steve Collins is an unknown quantity at this point
This message thread may give you a much better understanding of your towing situation as the trailer is the same, and the TV is only a tiny bit different than your Grand Cherokee:

http://www.sunlineclub.com/forums/ph...pic.php?t=1642
__________________

'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
Steve Collins is offline   Reply With Quote
Old 07-08-2008, 12:37 PM   #6
Junior Member
 
Join Date: Jun 2008
Posts: 8
SUN #633
jabfd32
hi everyone i do have the brake control and on my next trip iam going to
weight the toung of the trailer. and move gear around . ill let know how i make out .
thanks a lot jeff
__________________

__________________
87 t1550
93 jeep grand cherokee
jabfd32 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
Tires Viking Repairs and Maintenance 8 02-28-2010 03:24 PM
Tires ?? heaton Repairs and Maintenance 27 07-03-2008 09:54 PM
Can someone help me with tires! dan&deb Towing and Tow Vehicles 11 03-20-2008 06:51 PM
Tires Honda03842 Towing and Tow Vehicles 8 11-19-2007 10:21 PM
Tires on your QUE ELPilotto Sunline Que 3 10-26-2007 05:09 PM



Disclaimer:

This website is not affiliated with or endorsed by Sunline RV or any of its affiliates. This is an independent, unofficial site.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:19 AM.