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Old 06-08-2015, 11:23 AM   #1
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Swaying problem Help

Just made our first long haul trip 800 mi. I am driving 1/2 ton GMC Yukon and pulling a Keystone Carbon 27 toy hauler with a WD hitch and sway control. I was really surprised by how much side to side swaying I was having. Has anyone else experienced this? I know when semi's go past to expect some pulling but this occurred on the open road when no one was passing.

I was wondering if the camper axles might be out of alignment?

Thx Gobb
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Old 06-08-2015, 12:18 PM   #2
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Physics. That trailer probably has a large surface area to act like a sail with the wind forces from passing vehicles. And, your truck is a half ton. How heavy is the trailer? Is the weight within the truck's capacity specs? If the trailer is tail heavy it may also cause swaying or even fish tailing.


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Old 06-08-2015, 02:26 PM   #3
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Dis you have any toys in the back of your toy hauler? If so, it's possible the tongue weight was less than the recommended 10% (approx) of the total trailer weight.

Also check tire inflation.
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Old 06-08-2015, 02:42 PM   #4
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1/2 ton GMC Yukon

Are your tires on the Yukon LT or Passenger tires. P tires have softer sidewalls. Are they air up to max side wall. Could be a contributing factor.
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Old 06-08-2015, 03:45 PM   #5
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Too much trailer not enough truck
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Old 06-08-2015, 06:45 PM   #6
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The primary cause of trailer sway is insufficient tongue weight, i.e. less than 10% of the total trailer weight resting on the hitch. 11-12% is even better. Get the rig to a scale, loaded for travel, and get the weights on truck and trailer axles, and get the truck weight with and without the trailer hitched (to get tongue weight). You may have too much weight loaded behind the trailer axles, lifting weight off the front. Newbies often do this intentionally, trying to reduce the laod on the tow vehicle. Bad plan!

Other contributing factors are the rest of the hitch set-up, e.g. trailer level, spring bars adjusted for weight, ball angle, etc.
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Old 06-09-2015, 05:43 PM   #7
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Hitch mnf believes my ball and sway may need tweaking I will try that next. Thanks for the replies.
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Old 06-10-2015, 04:48 PM   #8
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I would verify that you have enough tounge weight and the trailer is balanced properly first and THEN adjust the hitch be it to add more weight to the truck or take some off. Sounds like you need to get some weight forward onto the truck more.
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Old 06-10-2015, 06:16 PM   #9
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I'm guessing your issue is that the trailer is overweight for your vehicle. Your Yukon is rated to tow approximately 8500 pounds. Your trailer weighs 6800 pounds dry with a 4200 cargo capacity. That easily puts you at your max with just one toy!
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Old 06-11-2015, 09:23 PM   #10
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All replies have good advice and recommendations. One other thing that contributes to excessive sway is the distance from trailer-ball to rear axle of tow vehicle-that falls into the category Motorpro and Dutch Star Don addressed.
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Old 06-14-2015, 09:15 PM   #11
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GOBB, I highly recommend this article for setting up and adjusting your WD hitch and ball mount. Can we get a progress update?
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Old 06-15-2015, 10:54 AM   #12
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Quote:
Originally Posted by MotorPro View Post
Too much trailer not enough truck
My first thought, too.
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Old 06-15-2015, 12:45 PM   #13
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What kinda toys is he haulin' in the back of that toy hauler. Sounds like it could be too much weight too far back.

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Old 06-15-2015, 10:54 PM   #14
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Update: The SUV is set up to pull up to 8500. With my Ultra (800Lbs) or with out it sways, yes more with bike in it. There isn't much weight to move forward I have loaded what I can in the forward area or rear of the truck. I have measured the heights of the camper and hitch etc and it is within the mnf tolerance. I am thinking that the truck is at it's limit and that the wheel base may be to short.


I am thinking about 3/4 tn truck. Dodge or Ford? Gas or Diesel?
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