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 > WD hitch instructions conflict with GM

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LarryL

FL

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Posted: 06/11/18 07:48pm Link  |  Quote  |  Print  |  Notify Moderator

I have a Husky TS Center Line 800-1200 pound WD hitch. TV is a 2017 Silverado 1500. Trailer is Sloaire 297RLDS. Specs rate TW at 615 and dry trailer at 5775.

Husky instructions say to adjust spring bars so that "The tow vehicle should settle evenly front to back. The rear fender should not settle lower than the front fender"

The Silverado manual states:
"When using a weight-distributing hitch, measure distance (2) before coupling the trailer to the hitch ball.
Measure the height again after the trailer is coupled and adjust the spring bars so the distance (2) is as close as possible to halfway between the two measurements."
Where distance (2) is the distance from ground to top of front fender.

There is also a chart in the manual that show Weight Distribution should be 50%.

Which way should I go?

Lwiddis

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Posted: 06/11/18 08:07pm Link  |  Quote  |  Print  |  Notify Moderator

GM


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bguy

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Posted: 06/11/18 08:07pm Link  |  Quote  |  Print  |  Notify Moderator

Being the manufacture I would think GM knows more about the truck than the hitch manufacturer.


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ScottG

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Posted: 06/11/18 08:59pm Link  |  Quote  |  Print  |  Notify Moderator

Reality is the back of the truck will settle more than the front. There's nothing wrong with that - the truck was built to carry weight in back.


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Posted: 06/11/18 09:26pm Link  |  Quote  |  Print  |  Notify Moderator

The front may rise 1/2”. So go by GM’s info.


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APT

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Posted: 06/12/18 05:29am Link  |  Quote  |  Print  |  Notify Moderator

Neither is very scientific, but GM's wording is slightly more so. Despite GM (and Ford) recommendations, I would target 100% front axle weight restoration with WDH on TTs. Estimating front axle weight by fender height unhitched vs. with adjusted WD has worked very well for many TT owners, but scaled weights would be even better.


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Hannibal

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Posted: 06/12/18 05:48am Link  |  Quote  |  Print  |  Notify Moderator

GM is correct.


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Lynnmor

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Posted: 06/12/18 06:16am Link  |  Quote  |  Print  |  Notify Moderator

Go by the truck owners manual. The rear of a tow vehicle can sag a little or a lot depending on spring rates. If the correct amount of weight is distributed to the front, and the rear sag is too much, add air bags or more spring.





TomG2

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Posted: 06/12/18 07:07am Link  |  Quote  |  Print  |  Notify Moderator

GM probably knows more about the effect of loading on their pickups than Husky does. The old, "The tow vehicle should settle evenly front to back." comes from the days when we towed with sedans and station wagons. Modern pickups have different capabilities. Dropping all four corners two inches worked great with a 1958 Roadmaster.

ktmrfs

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Posted: 06/12/18 09:52am Link  |  Quote  |  Print  |  Notify Moderator

Hannibal wrote:

GM is correct.


on my two 2500HD's I've tried both the GM recomendation and the "bring it back to unloaded" on the front.

I prefer the "bring front back to unloaded" rather than split the difference on the front. Less front end wander felt more controlled and a better ride.

In both cases the back is below the unloaded height, but I don't worry about the back.

Now, my case I have 1400-1500 lbs on the tongue.

On most GM do NOT go below unloaded, you can end up quickly on the front end overload bumpers, which makes for a terrible ride.

try both ways and decide which works best for your towing situation.


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