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Old 04-09-2008, 10:10 PM   #85
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Tongue Scale

You can measure the tongue weight with a bathroom scale if you don't want to spend the dough to buy an actual tongue weight scale.

Park the trailer on level solid ground. Put a brick on the ground 1 foot to the right of the center of the jack post. Put the scale 4 feet to the left of the center of the jack post. Put a stout board across the two. Now lower the jack onto the board. You use math to figure out what the tongue weight is based on the weight reading on the scale. In this case, it's five times the reading on the scale.

So, if the bathroom scale reads 240lbs, you've got a 1200lb tongue weight.

Formula is:

D1= jack center line to brick centerline
D2= jack center line to scale center line
P = scale reading
TW = tongue weight

So for example, D1 = 1 foot, D2 = 4 foot, P = 175 lbs

Moment 2 = P * (D1+D2) = 175 lbs * (4+1 feet) = 875 ft-lbs
Moment 1 = Moment 2 = 875 ft-lbs
TW = Moment 1 / D1 = 875 ft-lbs / 1 ft = 875 lbs tongue weight

Keeps it simple by making D1 = 1 ft.

Have fun!
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Old 03-09-2010, 11:21 AM   #86
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Washers for Equalizer

Anyone know if the washers that fit on the Equalizer hitch are only available through Equalizer, or can I buy some at any hardware store?
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Old 03-09-2010, 12:13 PM   #87
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You can buy them at Home Depot or Lowe's IIRC. They HAVE to be the zinc washers. The steel ones will compress too much under the stresses applied by the hitch system and weight of the trailer.
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Old 05-13-2010, 04:33 PM   #88
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Deciphering the Scale Numbers

Back around post #52, Mikethefixit suggested I put the rig on the scales for a final check. I did last summer when we were on a caravan. I just put a post on this thread http://www.airforums.com/forums/f238...-in-17984.html to get some help deciphering the numbers.

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Old 05-17-2010, 04:43 PM   #89
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The June issue of Trailer Life magazine included an article specifically reviewing the Equal-i-zer trailer hitch. In the article, the author stated that the test trailer was too light in the tongue and had a strong sway problem. He said that the Equal-i-zer brought the rig into comfortable towing status.

I don't think it is acceptable for the hitch to mask the issue of too little weight on the tongue without it being corrected, but it does show that the Equal-i-zer brand does offer a high degree of sway control.
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Old 01-22-2011, 07:34 PM   #90
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Old post update

Posting here for the Rollertoaster:
Yep, 1200# bars were too much for the rig after all. We sold them pretty much right away and went back to the 1000# Equalizer set up, along with some airbags on the TV.
After many more happy miles, all is good. Except for that crow pie.
Thanks especially to Andy and Michelle...
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Old 01-23-2011, 09:26 AM   #91
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Quote:
Originally Posted by Minnie's Mate View Post
The June issue of Trailer Life magazine included an article specifically reviewing the Equal-i-zer trailer hitch. In the article, the author stated that the test trailer was too light in the tongue and had a strong sway problem. He said that the Equal-i-zer brought the rig into comfortable towing status.

I don't think it is acceptable for the hitch to mask the issue of too little weight on the tongue without it being corrected, but it does show that the Equal-i-zer brand does offer a high degree of sway control.

Since the Equal-izer's performance is directly proportional to the tongue weight this unit must not have really had that much of a tongue weight issue if the Equal-i-zer stabilized it.


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Old 01-23-2011, 06:52 PM   #92
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Equalizer torsion bars offer the least give, when hitting bumps.

Andy
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Old 01-23-2011, 07:11 PM   #93
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Quote:
Originally Posted by Sean Woodruff

Since the Equal-izer's performance is directly proportional to the tongue weight this unit must not have really had that much of a tongue weight issue if the Equal-i-zer stabilized it.

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Are you saying that a higher tongue weight makes the Equal-I-zer work better.
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Old 01-23-2011, 08:29 PM   #94
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Quote:
Originally Posted by cosmotini View Post
Are you saying that a higher tongue weight makes the Equal-I-zer work better.
I will field this question so Sean doesn't have to get involved in an in depth discussion of a competitive product.

The friction that is used to dampen sway on a basic Equal-I-Zer hitch is generated in four places. (I am aware that the company now makes some hitches that may operate differently). The first two are the points where the WD bars rotate in the hitch head. The other two are where the hitch bars move across the rear supporting brackets.

There are many factors that control the amount of friction that is created. One of the factors is the amount of force that is pushing the two surfaces together. This force is effected by the angle of the hitch head, how much force is being applied to the WD bars to transfer weight to the front of the TV, and the vertical position of the brackets supporting the rear of the WD bars.

So if everything else is equal and the tongue weight is increased, more force will need to be applied to the WD bars to transfer some of the addition weight. That increased force will increase the friction at the four points and thus increase the sway dampening.

Regards,

Ken
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Old 01-23-2011, 08:34 PM   #95
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Thanks, Ken...

You're right on.


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Old 01-23-2011, 09:03 PM   #96
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Quote:
Originally Posted by w7ts

I will field this question so Sean doesn't have to get involved in an in depth discussion of a competitive product.

The friction that is used to dampen sway on a basic Equal-I-Zer hitch is generated in four places. (I am aware that the company now makes some hitches that may operate differently). The first two are the points where the WD bars rotate in the hitch head. The other two are where the hitch bars move across the rear supporting brackets.

There are many factors that control the amount of friction that is created. One of the factors is the amount of force that is pushing the two surfaces together. This force is effected by the angle of the hitch head, how much force is being applied to the WD bars to transfer weight to the front of the TV, and the vertical position of the brackets supporting the rear of the WD bars.

So if everything else is equal and the tongue weight is increased, more force will need to be applied to the WD bars to transfer some of the addition weight. That increased force will increase the friction at the four points and thus increase the sway dampening.

Regards,

Ken
Thanks for the explanation. I knew about the head angle. I never thought about the tongue weight having an effect.
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