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Old 06-12-2014, 04:51 PM   #1
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WDH set up/bounce issue

So I've been toying around with my hitch ball height and spring bars trying to remedy "bounce" although it's more like a front to back rocking motion on the TV. I cinched up the spring bars (little to no weight on the hitch when I snap em up). Thoughts on what I can try to remedy the motion sickness? Truck has new shocks and about 80lbs in the tires.
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Old 06-12-2014, 05:08 PM   #2
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What you are describing is called porpoising, Did a search in the forum...
Look here. https://www.google.com/search?q=porp...ms.com&spell=1
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Old 06-12-2014, 05:08 PM   #3
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Quote:
Originally Posted by sledhead77 View Post
So I've been toying around with my hitch ball height and spring bars trying to remedy "bounce" although it's more like a front to back rocking motion on the TV. I cinched up the spring bars (little to no weight on the hitch when I snap em up). Thoughts on what I can try to remedy the motion sickness? Truck has new shocks and about 80lbs in the tires.
You indicated the tires are set at 80 psi. I am assuming that your truck has LT Tire? If not then I would highly recommend them. That solved the issue we had with bounce! If you do currently have LT tires then I would think airbags are your next solution. Do you have any sag with the truck?
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Old 06-12-2014, 05:24 PM   #4
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Originally Posted by Indymule View Post
You indicated the tires are set at 80 psi. I am assuming that your truck has LT Tire? If not then I would highly recommend them. That solved the issue we had with bounce! If you do currently have LT tires then I would think airbags are your next solution. Do you have any sag with the truck?
He's got a 01 gm half ton.
They did not have lt tires factory.
He or someone else would had to change them.


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Old 06-12-2014, 07:06 PM   #5
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My 01 Sierra door sticker requires LT tires at 50#. So I would say they are from the factory. I run mine at 50# and get porpoising with the TT, but not as much with the enclosed car trailer. Lower the tire pressure to 50# and load the nose a bit, see if that helps.
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Old 06-17-2014, 10:09 AM   #6
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Quote:
Originally Posted by Indymule View Post
You indicated the tires are set at 80 psi. I am assuming that your truck has LT Tire? If not then I would highly recommend them. That solved the issue we had with bounce! If you do currently have LT tires then I would think airbags are your next solution. Do you have any sag with the truck?
The truck does sag a bit when loading the trailer onto the hitch but with the spring bars I can level it out back to front. Yes I have LT tires on the truck.

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Originally Posted by f1100turbo View Post
He's got a 01 gm half ton.
They did not have lt tires factory.
He or someone else would had to change them.


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Nope got rid of the halfer I now have a 2500 Avalanche.

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Originally Posted by POS Camaro View Post
My 01 Sierra door sticker requires LT tires at 50#. So I would say they are from the factory. I run mine at 50# and get porpoising with the TT, but not as much with the enclosed car trailer. Lower the tire pressure to 50# and load the nose a bit, see if that helps.
I put the tires at their rated 80# max tire pressure as stated on the sidewall. This did nothing to remedy the porpoising. What did help is putting weight in the front of the camper and tightening up the spring bars as much as possible. I still get a little porpoising but not nearly as bad as it was.
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Old 06-17-2014, 01:05 PM   #7
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Getting some weight at the front helps. I always ride smoother as well. However, Indianapolis has some 'washboard' concrete that makes for a rough ride. At first I thought it was the setup, but driving on other concrete roads I don't have the rough riding. It's always on the same stretch of 465. It does subdue though when I load the front of the trailer and have cargo in the truck bed.
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Old 06-18-2014, 09:59 AM   #8
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I believe certain vehicle combinations are more sensitive to "porpoising" than others. And I also believe that running a WDH kit too close to it's TW limit is what could put these sensitive vehicle into such motion.

The stiffness of the suspension, in combination with the stiffness of the spring bars is what would combat this type of motion. If you can imagine what the rig looks like going over a wavy road surface, you would see the hitch point going up and down, the rig humping it's back like a porpoise, and those spring bars, acting like...springs!

What is your loaded TW?
What size WDH are you running?
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Old 06-18-2014, 10:03 AM   #9
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By the way, I used to tow a 3000 lb popup camper (375 lbs TW) with a FWD Chrysler minivan. Used a 400 lb rated Reese Single Bar WDH and a friction sway controller. The rig did very well for 7 seasons, but we did get "porpoising" regularly. I believe it was because we were only 25lbs away from our TW limit.

Conversely, we now have a 5200 lbs hybrid at around 700lbs TW, and use a 1000 lb rated WDH (Equal-I-zer). Rock solid, but by no means is it harsh. And the Mounty is a fairly short wheelbase vehicle, compared to most vehicles towing a 27ft trailer.
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