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Old 01-26-2013, 01:06 AM   #21
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Dynamic vs. Static loads

I figure that the condition that will overstress the axle is the impact of going over a bump. Think about a speed bump: when the rear axle of the TV hits it and lifts the rear of the vehicle, the tension in the spring bars will relax (right?). At that point, you would have a moment of little/no weight distribution. So the rear axle is seeing the full load. Plus the dynamic forces are stressing it, too.

I have found and read probably a dozen threads here about Yukon Denalis and towing, but never found a report that shows scale a weight of the front and rear axles with WD off. So I don't know if a good-size AS will exceed the stated limit in actual use.

I'm looking for a tow vehicle for my future AS. I find the Yukon Denali appealing but I can see that it's cutting it pretty close. (a couple of people here have reported a measured tongue weight over 1100 pounds; the Yukon's limit is 1100 pounds).
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Old 01-26-2013, 08:05 AM   #22
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Question Gawr..

Just don't exceed it....either way.
It's right there on the driver door post.
If your that close...
Start over.

A 10.5K rejuvenated hitch don't help a hoot axle wise.

Bob
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Old 01-26-2013, 08:43 AM   #23
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Quote:
Originally Posted by SSquared View Post
I have found and read probably a dozen threads here about Yukon Denalis and towing, but never found a report that shows scale a weight of the front and rear axles with WD off. So I don't know if a good-size AS will exceed the stated limit in actual use.
In our case yep... but not by much. 1st ticket no WD.
We were loaded heavy for extended off grid stay.

Bob
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Old 01-26-2013, 01:16 PM   #24
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Quote:
Originally Posted by SSquared View Post
If using a weight
distributing hitch, make sure not to
exceed the RGAWR before applying
the weight distribution spring bars.
With the wording it could just mean don't let the weight off the jack before applying weight distribution spring bars if it would exceed the RGAWR.
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Old 01-26-2013, 03:03 PM   #25
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Question

Would static overload cause excessive ware?

POI...yes I do adjust the WD jacks on the Hensley before retracting the tongue jack, only because it's much easier/quicker to do un-loaded and the jack cylinders are marked for varying loads.

Bob
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Old 01-26-2013, 04:48 PM   #26
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Quote:
Originally Posted by Jim Flower View Post
The specifications have become irrelevant, which is why no insurance company in the US has reneged on paying a claim due to a vehicle towing a trailer that has exceeded the manufacturer's "tow rating".
But if you are sued after an accident with your trailer and the plaintiff's lawyer finds out you had something overweight, you could be in trouble.

Here's a link to definitions about all these acronyms and terms:
Tow Vehicle Sizing

I'm not sure I agree with everything there though. For ex., the idea that you should not exceed 80% of the any limit. That's conventional wisdom and I've never seen proof of it. While it can be argued that the closer you get to a maximum rating of anything, the more risk you have, that is not necessarily so. Some of it may come from the belief that all the manufacturers lie about their truck ratings so they can sell more vehicles. That hasn't been proven either.

As I understand it, calculating tongue weight against payload or other weight maximums is not done by taking the total tongue weight of an unhitched trailer. The WD hitch transfers weight both ways—some to the trailer axle(s) and more to the tow vehicle axles. While there is a formula for this, most of us wouldn't understand it, so roughly it is 1/3 to the trailer axles and 2/3 to the truck axles. I see frequent posts on the Forum that don't take this into account when computing proper weights for the tow vehicle.

And last, tongue weight as stated by the manufacturers cannot be trusted. I have seen Airstream give different weights in different publications for the same model in the same year. And, filled propane tanks, heavier than OEM batteries, spare tire and other options can add a lot to tongue weight.

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Old 01-26-2013, 07:33 PM   #27
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You may be right Gene, but it is a pretty big " maybe" given the volume of fine print in the aftermath of the recommendations. Must be the same guys the manufacturers use in their final tow ratings.
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Old 01-27-2013, 11:01 PM   #28
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Thanks for the CAT scale data

Robert Cross,

Thanks for posting the before and after CAT scale data.
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Old 01-27-2013, 11:28 PM   #29
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