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Tool Talk Discussion Forum

Trailer Anti-Sway Devices

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Glenn F.

04-04-2008 09:49:50




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I don't know what they're called, but those anti-sway deveces which have a handle on either side of the tongue on a tag trailer...If a person has adequate tongue weight, there would be no sway/need for such a device, would there?

Am I missing something?

Thanks,
Glenn F.




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rustyj

04-07-2008 12:51:24




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
Try blowing a trailer tire at 70mph on the interstate without an equalizer/anti sway bar-s, and i guarantee you'll have to change yer drawers! And, i don't mean the ones in the trailer! Our Fire company handles accidents on the Interstate, near Pittsburgh, Pa. Where I-279 splits off of I-79, to go to Pittsburgh downtown. So, one evening, here comes Mrs. Whats her name, with a full size van, and towing a single axle travel trailer. She got mixed up, jammed on the brakes, the unit jack-knifed, and the sway started, and by the time she got stopped, everything in the trailer had either fallen off, or broke off, The trailer was on its side, and was a piece of junk! And, the hitch? Just a clamp on the bumper boat trailer hitch! The frame on the van was twisted and the bumper looked like a pretzel! Moral to the story: To be on the safe side--heed what the tow bar and trailer anti-sway folks have to say! They have spent many bucks figuring out what will keep ya safe when towing. Another thing: Be out there with yer trailer, on a fishing boat tow hitch, and have a hiway behemoth pass ya at speed! You'll have to stop at the next Howard Johnson's to change yer drawers, i guarantee that!

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T_Bone

04-05-2008 05:50:53




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
Hi Glenn,

Equalizer hitching is for trailers that are missed matched for the tow vehicle with the TV being to small to pull the trailer.

Equalizer hitching can if used improper, will remove traction from the TV axle.

Sway bars are a false sence of security for a badly loaded trailer.

I've pulled several 28ft TT and never used a equalizer or sway bars and never had a problem one. I've never used any type of sway/equalizer on any flatbed trailer.

One thing that I've always had, is more TV than my trailers required.

T_Bone

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jose bagge

04-05-2008 06:00:33




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 Re: Trailer Anti-Sway Devices in reply to T_Bone, 04-05-2008 05:50:53  
Not entirely true-
every hitch has a max tongue weight with and without equalizers stated on it. Is the label ( which has gotta be some government required liability deal) endorsing "mis-matched" towing?
That being said- I never have to worry about using either when i pull with the "Big Truck".



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T_Bone

04-05-2008 06:15:16




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 Re: Trailer Anti-Sway Devices in reply to jose bagge, 04-05-2008 06:00:33  
Hi jose,

Ya, but that's a hitch rating problem your talking about, and not the reason why most people use equalizer hitching.

Even the factory receiver on a F350 DRW requires a equalizer to use the factory receiver at maximum design rating but not because the TV it's self requires equalizer hitching for pulling the load.

Two different problems.

T_Bone



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jose bagge

04-05-2008 11:11:25




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 explain this to me..... in reply to T_Bone, 04-05-2008 06:15:16  
...I know the damn things work, because you can see the change in rear ride height when you attach the bars...but explain the physics of this to me- how the heck does the equalizer bars transmit load beyond the hitch? I have never been able to noodle this through!



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T_Bone

04-05-2008 21:01:38




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 Re: explain this to me..... in reply to jose bagge, 04-05-2008 11:11:25  
Hi Jose,

I never said a equalizer doesn't work. I just stated that a equalizer is used for missed matched trailers to the TV with the actual cause being the TV is too small to pull that trailer.

A equalizer is a first class lever that transfers load weight from a pivot point(the hitch ball) both forward to the TV front axle and rearward to the trailer axle(s).

Think of the trailer and TV as a straight beam between the TV front axle and the trailer axle(s). That beam has a bow in it at the hitch ball point. To straighten this "beam" you can add a equalizer to redistribute the weight both forward to TV front axle and reward to the trailer axle(s).

The end result is you have now straighten that beam by unloading weight off the rear TV axle and thus have less traction.

This is fine as long as your on pavement and pulling just fine WITHOUT any traffic or roadway problems. When the "all $hit happens", then the rear TV axle has less traction, thus TV control is less than pulling without equalizer hitching.

I've just scratched the surface on WD hitching and more questions have risen that's been answered here.

For a great in depth explantion of how equalizer hitching works and pictures of the redistributed weight, see Ron Gratz explantion on equalizer hitching. You'll see it took him several pages to explain how and why equalize hitching works as this is a complicated subject. Ron is a retired civil engineer.

T_Bone

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jose bagge

04-06-2008 05:04:31




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 Re: explain this to me..... in reply to T_Bone, 04-05-2008 21:01:38  
I saw a Big RV pulling a HUGE box trailer ( prbably a race car), and he actually had a rig with another set of tires up under the ball.



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Jerry/MT

04-05-2008 20:46:04




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 Re: explain this to me..... in reply to jose bagge, 04-05-2008 11:11:25  
Those bars are just big springs and when you crank up up, they lift the back end of the TV and transfer weight to the front wheels.



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Randy Novak

04-04-2008 19:39:28




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
I pull a 26 ft travel trailer. I got the Equalizer brand hitch. It works well. It is load distributing but also due to the design it prevents sway. Friction on the bars does the sway control. I blew a tire at 60 mph on the rear of my sub pulling trailer an it tracked straight til I could pull over on the interstate. I have pulled travel trailers and recommend a equalizer hitch for sure. It helps vehicle tracking,prevents the dip motion between tow and trailer when hitting cracks and bumps. Have you ever watched some one with out and the front end is way up? Not safe.

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Jlmtractor

04-04-2008 18:39:55




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
ok why do you need an anti sway device when pulling a camper but you dont when pulling say a 24 foot deckover tongue trailer. is it because of the height and top heaviness of the camper? what is the reason for them



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jose bagge

04-05-2008 05:56:54




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 Re: Trailer Anti-Sway Devices in reply to Jlmtractor, 04-04-2008 18:39:55  
tractor-trailer produced cross winds....
"sail area"!
also true with any other "box trailer".
Now combine that box trailer with a motor home- hang on, baby!



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Jerry/MT

04-04-2008 21:29:39




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 Re: Trailer Anti-Sway Devices in reply to Jlmtractor, 04-04-2008 18:39:55  
A camping trailer has a lot of side area so crosswinds or the draft from a tractor trailer rig can induce sway. A flatbed trailer is less sensitive to crosswinds and drafts, but it will sway under the right conditions.



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Jerry/MT

04-04-2008 18:19:35




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
Yeah, you still need one. There is nothing but the friction on the ball and the lateral resistance of the tires to damp out any sway forces and sometimes that"s not enough, even with the desired 10-15% of the trailer weight on the tongue.



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Chuck Luedtke

04-04-2008 15:42:27




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
There is one called the Equalizer sway control hitch. It is supposed to do sway control as well as equalize the tongue weight and apply it to the front of the vehicle. I have looked at them because I am looking to buy a travel trailer, and both camping places that I stopped at highly recommend them. I was thinking of buying one when I get a camper and then get some brackets and use it on my flat trailer for when I pull the tractors around as well. I know a fifth wheel or gooseneck is the way to go, but I'm not going that route until I get a bigger truck.

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Don L C

04-04-2008 16:01:04




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 Re: Trailer Anti-Sway Devices in reply to Chuck Luedtke, 04-04-2008 15:42:27  
Chuck ---

Don't even think of pulling your travet trailet with out a equalizer hitch....Reese uses the type where the two bars fit over a cam lobe..... Others use a friction adjusted slidding fixture..... .I have had both and I like the Reese better..... .



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Crem

04-04-2008 15:18:54




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
The link shows the type of sway bar that I use with my trailer. When I had a travel trailer, I used one on each side. You can also pick them up at swap meets.



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jose bagge

04-04-2008 11:32:45




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
Two different devices at work here-
Load Equalizers: these transfer weight off of the tongue and into the chassis of the tow vehicle, allowing your hitch to hadle more weight. Essentially allows you to pull more than
you should be with the vehicle you have. When you preload the bars, you'll actually see the ride height of the tow vehicle raise up.

Anti-Sway: basically a "friction shock" that dampens trailer movement transmitted through the hitch to the vehicle. This movement could be cause by wind, passing traffic, road conditions, etc. Also makes tongue weight less critical to overall ride ( without, I've actually had to pull over and jockey horses around in 3 horse slant load to optimize handling- with, it didn't seem to matter)

Usually the Anti Sway attaches to the equalizer hitch, so you'll rarely see the anti Sway without the equalizers

Don't use use either when I pull with the truck- use both when I pull with the suburban or the motorhome ( and both help a lot in those circumstances).

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Mike M

04-04-2008 10:57:01




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
GO GOOSENECK ! Far better choice.



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jose bagge

04-05-2008 06:02:26




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 Re: Trailer Anti-Sway Devices in reply to Mike M, 04-04-2008 10:57:01  
you're right- but how do i hook it to my Suburban?



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Mike M

04-05-2008 15:02:41




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 Re: Trailer Anti-Sway Devices in reply to jose bagge, 04-05-2008 06:02:26  
Cut a hole in the roof !



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mjbrown

04-04-2008 10:12:15




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
Load equalizing bars help keep the front of the tow vehicle from porpoising but don't reduce side to side sway. A sway control unit that mounts on the side of the hitch/trailer acts like a linear disc brake to reduce sway. Tongue weight has some affect on side to side sway but axel placement is the real culprit. 30% of the trailer length should be behind the axels and 70% in front of the axels.

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Allen in TN.

04-04-2008 10:11:46




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
Back in 70"s when pulling travel tralers, We used the "Anti-Sway" Sliding plate bar to help stop sway when a big semi pass you on interstate. was a must have item for most of us.



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glennster

04-04-2008 09:55:44




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 Re: Trailer Anti-Sway Devices in reply to Glenn F., 04-04-2008 09:49:50  
its called a load equalizing hitch. it will cut down on side to side sway, it also helps to stop the tow vehicle from porposing down the road as it shifts weight to the front of the tow vehicle.



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