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Open Roads Forum  >  Fifth-Wheels

 > Please help me identify 5th wheel towing issue.

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ZeeLet50

Alden, New York

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Posted: 08/06/19 02:08pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 2016 3/4 ton GMC gasser with Anderson hitch connected to a 32' trailer that weighs 12.5k with about 2100lbs pin weight. When traveling I get a jerking in TV when there is a load. Happens going up a hill or slight elevation in road. Usually felt more above 30mph. I have a cushioned pin box and Morryde Cre3000 added to suspension. Is this "chunking" or do I have an issue with slipping tranny or chugging motor. Can't see tach moving. Never happens on down hills or full throttle pulls up hills. No issues noted when not towing. It can even happen on smooth roads. Its not constant but happens enough to be annoying.


2017 Grand Design Reflection 303RLS towed by a 2016 GMC 2500HD gas with Andersen hitch and B&W turnover ball mount.

BB_TX

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Posted: 08/06/19 02:32pm Link  |  Quote  |  Print  |  Notify Moderator

Actually it is called chucking and is caused by the push-pull effect of the truck and trailer on uneven road surfaces. Mine has some chucking on some concrete roadways even though they appear smooth. And none on others. And almost never on asphalt. Since you already have a Moryde pin box I don’t have any other suggestions.

cummins2014

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Posted: 08/06/19 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

I too tow with the Andersen and MorRyde, and it's a pretty smooth ride, some road conditions will create some chucking. Having the ability to adjust my aftermarket air bags , there has been on occasion where I could adjust the air pressure and it smoothed it up. But that has been rare . Generally it’s just the expansion joints .

Hopefully you will get it figured out , your description of it sounds somewhat unusual .

bpounds

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Posted: 08/06/19 03:10pm Link  |  Quote  |  Print  |  Notify Moderator

You gave values of 12.5k# and 2,100# pin. Are those the dry weights from the manufacturers brochure, or did you actually weight your rig.

Assuming those are your weights while towing, you are very light on pin weight. And I think the fact that it is a problem while angled up a hill, supports my theory.

Experiment with increasing your pin weight and see if that helps.

Your numbers are a 17% pin weight. Your goal should be more like 25%. Or at worst 20%.


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ZeeLet50

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Posted: 08/06/19 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

bpounds, yes those weights are guesstimates. I have not weighted it but it did seem to ride better when I had a 3/4 full water tank. So you may be on to something. How to load up more pin weight? Got a full basement and fully loaded under bed...hmmm. I may have a way to weigh pin at home with a scale that I had from TT. Pin weight dry is 1660lbs and my guess was a little high on trailer weight. GVWR is 12K so I am under that probably closer to low 11K which still puts me at about 20%

* This post was edited 08/06/19 03:35pm by ZeeLet50 *

laknox

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Posted: 08/06/19 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

I agree with bpounds; seems a bit light on the pin, so please weigh, or re-weigh, your rig, ready to camp. Also, how level are you? If you're more than a couple inches off-level (usually nose-high), you can experience chucking. Does this happen on all roads or just the ones you travel most frequently? Your length can have an effect in that you can develop a sort-of harmonic due to the distance between your truck and the FW axles. Speed can affect this, too, so speeding up/slowing down by even 1-2 mph, can change this.

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bpounds

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Posted: 08/06/19 03:29pm Link  |  Quote  |  Print  |  Notify Moderator

Yeah, get your actual weights and see what they tell you. As for water, kind of depends on where your tank is. Mine is all the way to the rear, so filling mine lightens my pin. And I still tow fine, with or without a full tank.

Also, take a look at your trucks springs. Sometimes you have an overload spring. Sorry, I don't know Chevy very well. But some trucks with just the right amount of load/sag, will bounce off of their overload leaf.

Lastly, don't underestimate the importance of good quality shock absorbers on the truck. Mine get Bilstein 4600's as soon as the truck hits my driveway.

ZeeLet50

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Posted: 08/06/19 03:39pm Link  |  Quote  |  Print  |  Notify Moderator

bpounds, I have fox 2.0s on all 4 corners. looking to get some sumo springs to help with weight even though I do not sag below level. That might help.

azdryheat

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Posted: 08/06/19 04:46pm Link  |  Quote  |  Print  |  Notify Moderator

5th wheels are similar in design to see-saws, they pivot in the middle and the ends go up and down. Not gonna be any fix for that.


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Etstorm

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Posted: 08/07/19 07:57am Link  |  Quote  |  Print  |  Notify Moderator

Also might try Roadmaster active suspension for tow vehicle

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