Good Sam Club Open Roads Forum: Fifth-Wheels: Chucking - trouble shooting
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 > Chucking - trouble shooting

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rhagfo

Portland, OR

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Posted: 02/01/20 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

dkuntz wrote:

Flute Man wrote:

Maybe your pin weight is too light.


Funny story - a 3/4ton duramax only has 2,150lb payload - so 1,700lb pin weigh is right where I want it before I add my family and other stuff to the truck.


Well sorry to say with a 2,150# payload, and already 1,700# dry pin that only leaves you 450# before you max payload, you always planing on hauling the 5er empty??
You have two choices, go by rear axle rating or get a bigger TV.
You state family, likely a couple kids and wife, maybe a dog, food. To stay within numbers not enough Truck.

you really need about 22% to 25% pin otherwise the 5er is trying to rock back and forth on the axles.


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mapguy

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Posted: 02/01/20 04:25pm Link  |  Quote  |  Print  |  Notify Moderator

Before doing an accessory buying -make sure your towing setup is correct.

Trailer frame needs to be level (parallel) to ground when hitched/loaded. Don't eye ball it -measure the main frame near rear and in front before the frame step up. Proper setup has these numbers nearly identical. My personal limit is one inch maximum difference with front being higher than rear. You ask why only an inch - because additional front height compromises suspension travel which amplifies the issue you are having now.

The next most important thing before investing in a cushioned pin box or hitch is Pin Weight. From my experience, which pretty much mirrors rhagfo above, is that as a percentage -Pin Weight needs to be around 20% of actual loaded trailer weight for the best ride.

A third thing is concerning the factory overload engagement. IS it staying fully engaged or fully disengaged? If spring is bouncing off overloads -the ride suffers greatly

I am a firm believer in having real shock absorbers on the trailer axles, too. They just calm the trailer down by getting rid of the sharp impacts.

Good luck!

Use Gross Axle Weight Rating when determining loads being acceptable or not. A trip to the scale is a very good idea -that way you know what the weights are exactly. You only tow "dry" one time on the trip home from buying the trailer.

* This post was edited 02/01/20 04:32pm by mapguy *

dkuntz

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Posted: 02/01/20 04:30pm Link  |  Quote  |  Print  |  Notify Moderator

mapguy wrote:



A third thing is concerning the factory overload engagement. IS it staying fully engaged or fully disengaged? If spring is bouncing off overloads -the ride suffers greatly

Good luck!


I don’t know what this is or I’m not understanding what you’re referring to. Thanks.


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mapguy

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Posted: 02/01/20 04:36pm Link  |  Quote  |  Print  |  Notify Moderator

dkuntz wrote:


I don’t know what this is or I’m not understanding what you’re referring to. Thanks.


Sorry - truck rear axle leaf springs from GM has an overload leaf configuration. AS it squats the overload leaf engages. They are setup this way to give a better empty ride.

* This post was edited 02/01/20 06:28pm by an administrator/moderator *

dkuntz

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Posted: 02/01/20 04:43pm Link  |  Quote  |  Print  |  Notify Moderator

Got it, yeah that makes sense. I’ll have to check that. Thanks.

* This post was edited 02/01/20 06:29pm by an administrator/moderator *

azdryheat

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Posted: 02/01/20 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

My chucking went away when I replaced my worn out/inadequate suspension components with EZ Flex. Used to be terrible chucking going over bridges and bumps. Sometimes I thought we'd loose the trailer it was so bad. With the EZ Flex that is all gone, well the majority of it. Cost me about $600 for three axles and the kit came with wet bolts so no more squeeks. Money well spent.


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garyp4951

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Posted: 02/01/20 06:12pm Link  |  Quote  |  Print  |  Notify Moderator

I think you need to load it up, and then see if the added pin weight helped.
You can't go wrong with a MorRyde pinbox, and Dexter EZ flex set up, and I'm sure it will be an improvement over the Lippert Road armor.
If your getting too much squat, and running on the overloads, add air bags to cushion, and level the truck.

Cummins12V98

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Posted: 02/01/20 07:10pm Link  |  Quote  |  Print  |  Notify Moderator

Air ALL tires based on load plus 5psi. Bilstein 4600 shocks. Trailer LEVEL. If u have air bags only add enough air to keep truck LEVEL. Monroe 555001 shocks on RV. 20% pin minimum, closer to 25% the better.

Be sure the ANDERSEN is PROPERLY fastened down!!!!!!!!!!!


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JIMNLIN

Oklahoma

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Posted: 02/01/20 09:05pm Link  |  Quote  |  Print  |  Notify Moderator

Quote:

I’ve come to the point where I’ve concluded there isn’t a silver bullet to resolve the issue

Just part of your questions but your correct ....there is no one thing that works for all chucking issues with a truck and 5th wheel or GN trailer.
I've seen post where the OP had chucking issues. He tried adjusting air pressures on the combo.....new shocks on the combo....even new tires and other low cost fixes that others had done. Nothing helped.
He finally moved the hitch back two inches in front of the trucks rear axle. This cured all his chucking issues. The rv dealer had the pin in his long bed set up 4" in front of the axle.

I had bad chucking issues with 32' 5th wheel rv trailer. It came with a 30" extended pin box which had the overhead about 6" from the end of a long bed DRW. I went with a 12" extended hitch box set to the same height and no more chucking.

What works for you will be just that and may not work for others.

Any wayz ....you could be short changing the trucks load carrying ability and as one member pointed out the overloads maybe carrying just enough weight to have a short compression and a severe rebound.

Google has loads of fixes for those that had the issue. You might wanta' spend some time doing that type of search.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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lenr

Indianapolis, IN

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Posted: 02/01/20 10:06pm Link  |  Quote  |  Print  |  Notify Moderator

Our chucking was 50% solved with a MORryde pin box, first. Then 98% eliminated by installing MORryde SRE4000 rubberized equalizer. The 4000 does this by reducing the jarring to the trailer which is another benefit of it. Watch the video on the MORryde web site. Both are easy to install and reasonably priced online.

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