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Old 03-22-2019, 02:03 PM   #1
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Weight distribution and sway control hitch not allowed

I saw this on the U-Hail website:

Weight distributing or sway control devices ARE NOT USED for towing U-Haul trailers. Towing a properly loaded U-Haul trailer does not require these devices. These devices may have a negative effect on vehicle handling and braking and may restrict the operation of the trailer coupling mechanism.

Any thoughts?
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Old 03-22-2019, 02:29 PM   #2
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No...

...Not really, they only use surge brakes on their larger trailers and don't care that your headlights are stargazing.

Bob
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Old 03-22-2019, 02:31 PM   #3
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I those trailers (at least the ones I've rented) typically deploy surge braking mechanisms, which are not (generally speaking) compatible with WD and anti-sway hitches as they can restrict the movement of the braking mechanism.

They typically also have low GVWR, which reduces risk further from sway / heavy tongue that requires WD.

My wife drove our 2500 from Denver to Las Vegas tugging a U-haul trailer which probably weighed about 1,500lbs loaded. I had no concerns whatsoever for her safety.

That is my guess anyways... there are lots of knowledgeable folks on the forum who I'm sure weigh in.
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Old 03-22-2019, 03:44 PM   #4
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Those over at UHaul are pretty smart people.
https://www.trailer-bodybuilders.com...ailer-dynamics
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Old 03-22-2019, 03:49 PM   #5
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What wulfraat said about surge brakes being incompatible with WD equipment.

That said, U-Haul equipment is exceeding robust for the expected abuse they go though. They won't let you tow if the tow vehicle to trailer combination is not safe based on their database.

They also have some design elements that help protect from sway. Namely longer draw bars. This helps to minimize actual tongue weight on the vehicle, yet ensures that the center of gravity (what it's really about) that we like to reference as having enough tongue weight, is sufficiently ahead of the trailer axle to ensure stability and sway resistance.
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Old 03-22-2019, 04:10 PM   #6
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Yep...they sure are smart. 🤓
A toy car on a treadmill.😂

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Old 03-23-2019, 04:52 AM   #7
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They have to dumb it down so people on forums can understand it
Jim Fait is also chairman of the SAE Trailer Committee, he understands towing dynamics better than anyone on this forum for sure.
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Old 03-23-2019, 05:02 AM   #8
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Talking

Let the sway games begin!

A parallel universe: http://www.airforums.com/forums/f382...er-193285.html

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Old 03-23-2019, 06:40 AM   #9
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Quote:
Originally Posted by Profxd View Post
They have to dumb it down so people on forums can understand it
Jim Fait is also chairman of the SAE Trailer Committee, he understands towing dynamics better than anyone on this forum for sure.
We be dumb all right...but happy.😁

I have never seen an AS designed like the trailer on the treadmill, single axle located dead center, and it sways...da.
I'm sorry but I feel that was just a cover your butt demonstration.

Setting up an AS properly is not SAE difficult. 🤓
Common sense, CAT tickets and/or a tape measure, all us dumb people can do it.👍

Bob
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Old 03-23-2019, 09:25 AM   #10
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Watched a single axle U Hall box trailer in a nose down position go into a yaw while being pulled by a Chevy Monte Carlo. I was behind him on the highway and we were both doing about 60. I noticed the sway and dropped back behind him. As the arc of the sway increased I knew he was going to lose control. I saw him throw on the brakes and the trailer back end of the car lost traction and the car skidded perpendicular to the highway. The trailer at that point was at a 45 degree angle fro the car. They all stayed upright and skidded off the shoulder. Very scary. I remember those trailers used to have decals that said max speed 45 mph on them.

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Old 03-23-2019, 09:40 AM   #11
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Boy are we a dysfunctional group. Toys are so beneath them as to provide no value?

For the uninformed, this is called a model based design. It is as legit as diagrams on a paper for which some might call a "drawing". Every discipline that has ever done design or engineering work, or heck just laying out a yard, utilizes drawings and if warranted, models to help understand and iterate.

It helps set the context, describe, and visualize the problem. In this case, to help layman better understand the dynamics of what's happening when putting too much load behind the rear axle. The proportions may be different, and it doesn't look like a 3/4 ton truck and AS, but the fundamental dynamics are absolutely the same.

For those interested in more than just "load behind rear axle". It's really about the center of gravity. When the center of gravity of the trailer is ahead of the rear axle, it is stable. Once the center of gravity moves rear, and ultimately past the rear axle, it get unstable to the degree that the center of mass goes further to the rear.

WD, PPP, HD trucks will help control and dampen the motions. But ultimately, get the tongue weight and center of gravity wrong, and with enough speed and force at play, it will bite you.
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Old 03-23-2019, 09:51 AM   #12
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Jack,

It's now 55mph to avoid... "Combination Disturbances" 🤔


"REDUCE SPEED to 55 mph or LESS.
Combination disturbances happen most often at higher speeds."

Toys do provide value...as playthings, like Airstreams.

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Old 03-23-2019, 10:39 AM   #13
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U-Haul has to make their trailers idiot proof so that weekend warriors who have never towed before can tow them without wrecking them. They seem to have settled on two basic conditions for safe towing, namely, loading the trailer with at least 60% of the load in front of the trailer axle, and having a tow vehicle with a curb weight of at least 80% of the trailer gross weight. They also tell you not to go over 55 mph even though they know most people won't adhere to that but hopefully will not exceed highway speed limits.
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Old 03-23-2019, 11:00 AM   #14
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Weight distribution and sway control hitch not allowed

Probably have the speed limit in their contract and on warning placards on their equipment to limit their liability. If you tow a Uhaul faster than what itís marked for, liability will land on you, if push comes to shove, for violating the agreed speed limit. I canít blame them. Iíve seen folks towing Uhaul hardware doing way over the speed limit. And in California, any vehicle towing a trailer is limited by law to no more than 55 miles per hour. Most of them are not even close to going the posted speed limit, trailer or not.
I usually set cruise control to no more than two or three MPH over, and I constantly get passed like Iím parked...and itís particularly disturbing when itís a dinky pickup pulling a 30 foot SOB toy hauler trailer with three feet of air under it. Their headlights are usually lighting up the trees as well.
I just let them go by, and hope I can stop before I get to their debris field down the road...

And we wonít talk about how they drive in the rain and fog. Lately itís been rather wet and windy out here.
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