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Old 12-09-2010, 07:55 PM   #1
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Back end of truck bouncing up and down while towing

I have a 30 foot travel trailer. I have stablizer bars and sway bars. Anyways when I hit certain areas of road my back end goes up and down real fast like the road is real ruff. Unsure if this could be because overweighted. Will it help to stiff suspension in or put more or less weight on rear end?
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Old 12-09-2010, 08:15 PM   #2
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Sounds like you need to adjust your WD. I'd try putting a little more weight on the rear wheels.
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Old 12-09-2010, 08:17 PM   #3
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I will give it a try. Thank you. I'm trying to avoid spending more money on things besides camping things.
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Old 12-09-2010, 08:28 PM   #4
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May be worthwhile to take your set-up and weigh it at a CAT scales. You should get the front and rear axles weights of your TV and axles weight of the camper while hooked up, then re-weigh the TV front and rear axle weights. That will give you all the info you need...hitch weight, total camper weight, amount of weight transferred to the front axle of the TV.

You should be looking for 10 - 12% hitch weight of the total camper weight.

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Old 12-10-2010, 08:54 AM   #5
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May be worthwhile to take your set-up and weigh it at a CAT scales. You should get the front and rear axles weights of your TV and axles weight of the camper while hooked up, then re-weigh the TV front and rear axle weights. That will give you all the info you need...hitch weight, total camper weight, amount of weight transferred to the front axle of the TV.

You should be looking for 10 - 12% hitch weight of the total camper weight.

Dave
This weigh-ins should determine if your WDH is setup correctly. I have mine set up to add about 40 lbs. to the front axle. That gets some added weight on the front axle, but still lets the rear axle carry most of the weight.

What is the tongue weight, and what is the rating of your spring bars ?? Too stiff or too light of bars can cause problems.
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Old 12-10-2010, 10:34 AM   #6
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Sounds like you need to adjust your WD. I'd try putting a little more weight on the rear wheels.
I would reach the opposite conclusion. Perhaps there is too much weight on the rear axle. I transferred a little more weight to my front axle to reduce bouncing at the rear.
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Old 12-10-2010, 10:51 AM   #7
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When I first got my 6800lb Keystone TT I had this problem. The rear suspension on my 1500 dodge was too light so I adjusted the hitch for a lot of WD. The porposing was caused by too much rebound in the spring bars. Once I put more weight on the rear wheels it almost completely stopped.
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Old 12-10-2010, 12:48 PM   #8
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What year and/or mileage is on your tow vehicle? The factory shocks are not exactly the best choice for towing, and they last about as long as the factory warranty does, at least on my vehicles. I put a set of Bilstein gas shocks on my Ram, and it stopped the bouncing very well. I had 60k on it at that time, incidentally. Really helps the ride when not towing, too! Randy
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Old 12-10-2010, 01:46 PM   #9
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I have a 2005 gmc sierra with about 95,000 miles. I do remember leaving the dealership on some ice and my tires spun fairly easy ( by my opinion). I figured with about a extra 500 -1000 pounds sitting on my truck the task would of been harder

side note: only certain sections of road would do it not all the way home. I do have sometimes without towing with my truck or others vehicles sometimes they hope a bit if road is not done the best. But i will try to add more weight to rear end.

it was first tow so may need some adjusting to find my sweet spot.
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Old 12-10-2010, 01:57 PM   #10
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side note: only certain sections of road would do it not all the way home. I do have sometimes without towing with my truck or others vehicles sometimes they hope a bit if road is not done the best. But i will try to add more weight to rear end.
I hope you realize that with the statement of adding more weight to the rear end of your GMC, the poster meant by your adjusting your WDH. And I am not sure if you need more or less back there....that is where the weigh-in at a CAT scale or the local rock quarry can give you the important figures.
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