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Old 10-25-2019, 08:03 PM   #1
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Chucking

Recently purchased 38 ft Columbus Compass 5th wheel. Pulling it with Chevy Silverado 2016, 2500hp gasoline engine. Have terrible time with chucking. Doesnít begin to smooth out until about 50 mph. Any ideas what causing it or any ideas how to fix?
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Old 10-25-2019, 08:12 PM   #2
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My first thought is air drag. Maybe some pics of front and side views would help us to see...
If the front of your truck comes up even one inch it can have a huge effect.
Do have somewhere to test driving at various low speeds to see when it starts, when it's worst...
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Old 10-25-2019, 08:24 PM   #3
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Are your trailer brakes dragging? Also may jack up each tire and spin them and make sure there is no drag.
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Old 10-25-2019, 08:48 PM   #4
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What is your set up with regards to hitch? Slider?
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Old 10-25-2019, 09:18 PM   #5
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Does it do it just on the interstate? Those concrete breaks can contribute to chucking. Or does it do it on all flat paved surfaces?
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Old 10-25-2019, 09:24 PM   #6
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Does it do it just on the interstate? Those concrete breaks can contribute to chucking. Or does it do it on all flat paved surfaces?
That was my thought. I put a set of airlift springs in the back, give it about 15psi and it stopped that annoying expansion joint bounce.
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Old 10-28-2019, 05:59 AM   #7
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Slider hitch
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Old 10-28-2019, 06:00 AM   #8
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Does it on all roads.
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Old 10-28-2019, 06:01 AM   #9
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Have Timbrens? On it instead of airbags.
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Old 10-28-2019, 07:45 AM   #10
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Which model hitch do you have?
What's your pin weight?
(It would be good if you had a full set of scale weights for us?)

If all your numbers are good (pin weight ratio especially) then some type of air ride pin box may help with the problem.
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Old 10-28-2019, 08:11 AM   #11
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I guess we need to know what YOUR definition of 'chucking' is?

Chucking is something that can happen at start out or stopping or anytime there is fore and aft movement between the tow vehicle and trailer and is usually caused by slop in the hitch jaws to pin box or movement from a slider hitch.


Sometimes bucking or porpoising is often mistakenly referred to as chucking and is most times caused by highway expansion strips, uneven road pavement or an improper hitch set up.

Here is how eTrailer defines chucking...

"What is chucking?"


Expert Reply:
"Chucking and jarring while towing a 5th wheel trailer (or any trailer for that matter) is unavoidable because the trailer itself is not one piece with your vehicle. When your truck starts to move forward from a stop your trailer is still sitting static and so there will be a slight jolt; the same thing happens when you slow down. Since the front end of your trailer is connected to your truck, when your truck starts to slow down your trailer is still moving forward so it will give you a slight push at first."


Here's a video from LCI..
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Old 10-28-2019, 10:00 AM   #12
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We get a severe jerking motion when driving. Appears to partially smooth out around 50+ mph.
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Old 10-28-2019, 10:42 AM   #13
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Quote:
Originally Posted by Dutchtreat1022 View Post
Recently purchased 38 ft Columbus Compass 5th wheel. Pulling it with Chevy Silverado 2016, 2500hp gasoline engine. Have terrible time with chucking. Doesnít begin to smooth out until about 50 mph. Any ideas what causing it or any ideas how to fix?
Until this last season I was towing my 5th wheel with a Chevrolet 2500hd 6.0l. I too had the same issue with chucking and it drove me nuts.

To try and resolve the issue, I first added a set of airbags to the rear. This helped some by leveling the truck but the chucking issue was still there.

The second adjustment I made was the addition of an Trailair pinbox. This provided the most improvement by removing almost all chucking and drivability issues caused by the chucking. The pinbox is not cheap but it does provide a solution to the issue.

https://youtu.be/2i4D7akkZtk

Hope it helps,
Tom
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