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Tool Talk Discussion Forum

How to properly balance a trailor load??

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Louie

01-25-2005 10:35:19




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I have just added "flip up ramps" to my 16ft trailor. They needed to weld about an 24inch extension off of the back to hinge the ramps so my bushog would fit onto the trailor, when the ramps were in the transit position. Now the trailer tends to 'fishtail' when pulled without a load. Any fix?

Also when I load the tractor and bushhog what is the proper way to balance the load. I heard the best way is to hook up the trailor to my truck without a load, then take a yardstick to the back bumper of the truck and draw a mark. Then load the tractor and bushhog slowly to the front of the trailor. When the trailor starts to tip forward and the back bumper goes about 3 inches below the mark with the empty trailor, that this is the best indicator for a properly balanced load. Any ideas??

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Kendall

01-27-2005 07:12:31




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 Re: How to properly balance a trailor load?? in reply to Louie, 01-25-2005 10:35:19  
60% of your load is suppose to be in front of the trailer axel. Fishtailing is the result of too much weight behind the axle.



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Red Dave

01-25-2005 11:08:51




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 Re: How to properly balance a trailor load?? in reply to Louie, 01-25-2005 10:35:19  
I've always used the rule of thumb that tongue weight should be about 10% of total trailer weight. That means if your loaded trailer weighs 5,000lbs, you should have about 500lbs tongue weight. I don't know if that is chiseled in stone anywhere, but it has worked for me for many years.

If you added 24 inches to the back of your trailer, you may have shifted the center of the trailer's empty weight to the rear, causing the tongue to be light. That can cause a trailer to be unstable.

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T_Bone

01-26-2005 01:40:38




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 Re: How to properly balance a trailor load?? in reply to Red Dave, 01-25-2005 11:08:51  
Hi Louie,

Careful here as if you load this trailer you won't make it very far without biting the big one,ie; accident. If the trailer pulls bad empty it will only get worse with load weight applied, increasing sway.

We'll assume your working with a tandum axle, tag trailer. Unkown tow vehicle type.

Tires, axles, suspension, frame, coupler all rated for the intended gross loaded weight?

GVWR = gross vehicle weight rating, or trailer weight plus loaded weight can NOT exceed GVWR. Look for the mfg tag on the tongue frame area.

Measure from the center of the coupler to the center of axle(s). This measurement should be 2/3 of your total trailer length from the coupler to the end of trailer.

Example: If your total trailer length is 18ft, then the center of coupler to the center of axles should be approx. 12ft.

When you added the extra 2ft on the back of the deck, this unloaded the required 10% to 15% tongue weight causing the sway condition.

You need to find the above coupler to axle distance then add more length to the tongue of the trailer if your short (most likey).

Once you increase the tongue length then you add more stress to the frame. Your asking alot of a trailer frame once designed as a 16ft trailer.

As Dave pointed out using a rule, you can also use your tongue jack to set load weight. Run the jack down on a empty trailer just to where it touchs the ground, then run the jack up 2". As you load weight observe the jack to ground clearence. On most tow vehicles you don't want to be less than 2" as that indicates to light of tongue weight for a given load.

Are you sure you don't want to buy the correct trailer for the intended load?

T_Bone

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Louie

01-27-2005 09:59:47




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 Re: How to properly balance a trailor load?? in reply to T_Bone, 01-26-2005 01:40:38  
I cannot tell you how much I appreciate the education. I am going to cut off the extension with a welding torch. No big deal and keep on hauling the tractor and bushhog as I have for the past several years.

Now I know which forum to post to, I have a Massey and usually post there, this is great.



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paul

01-26-2005 06:47:16




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 Re: How to properly balance a trailor load?? in reply to T_Bone, 01-26-2005 01:40:38  
Would not repositioning the axle(s) be the 'correct' fix for this, moving it back just over a foot about?

I know, too expensive to do unless one does it themselves.

Think he kinda ruined the trailer at this point, by totally unbalancing it. I've towed a few farm implements home with the pickup at real low speeds that were rear-heavy, and _not_ fun, that whipping can really bite a person on a downhill, can't get control back.

He repeated his question on most of the forums around here, hope he goes through them all & picks out the good answers, not just the easy ones.

--->Paul

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thurlow

01-26-2005 08:30:22




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 Re: How to properly balance a trailor load?? in reply to paul, 01-26-2005 06:47:16  
You're right, many 'fixes'; only one "correct" fix, as far as I'm concerned; I would either get another trailer or move the axles back to the correct place. Even after moving the axles, he may have something that's not really usable, because of the increased stress on structural members.



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