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 > Tongue Weight Calculation

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Sarge1201

Oregon City, OR

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Posted: 08/18/20 08:55pm Link  |  Quote  |  Print  |  Notify Moderator

Greetings From Oregon,

This will be my first of probably many posts/questions. Thank you all first for already giving me tons of knowledge and info.

I recently purchased a 33' travel trailer with a combined (dual) rear axle weight of 7700 lbs loaded. I have calculated my tongue weight at 1500 lbs by running across the scale both with the loaded trailer and without then using subtraction.

Since we want a target tongue weight of around 13 to 15% of the trailer weight, my question is, is the tongue weight included in the trailer weight? In other words, my two trailer axles weigh in at 7700 lbs. But that doesn't include the 1500 lbs that the tongue weighs. If the weight of the tongue is included in the calculation, I'm right on target. However, if not I'm closer to maybe 19% of the trailer weight.

Trying to set up my WDH. Maybe I'm over-thinking.

What do y'all think?

Sarge

nickthehunter

Southgate, MI

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Posted: 08/18/20 09:09pm Link  |  Quote  |  Print  |  Notify Moderator

Its the weight of the tongue divided by the total weight of the trailer

Flute Man

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Posted: 08/18/20 09:31pm Link  |  Quote  |  Print  |  Notify Moderator

The total weight of the trailer is the sum of the tongue and the two axles.


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Sarge1201

Oregon City, OR

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Posted: 08/18/20 11:49pm Link  |  Quote  |  Print  |  Notify Moderator

Got it. Total weight of entire trailer including TW,

Thanks

ACZL

UPstate,NY

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Posted: 08/19/20 12:19am Link  |  Quote  |  Print  |  Notify Moderator

FWIW, I just watched yesterday I think, a YouTube vid by Big Truck RV guy about a new fangled receiver hitch w/ built in dial scale for weight. He goes onto say about calculating weight distribution etc. I actually found it quite informative and as for the product review, sounds good. Can be had at e-trailer.


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Mickeyfan0805

SE Wisconsin

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Posted: 08/19/20 08:36am Link  |  Quote  |  Print  |  Notify Moderator

Sarge1201 wrote:

Got it. Total weight of entire trailer including TW,

Thanks


Correct.

Trailer Weight - 9,200
Tongue Weight - 1,500
Ratio - 16.3%


It still seems a bit high, but if your tow vehicle can handle it, you should be ok.

CharlesinGA

South of Atlanta, Georgia

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Posted: 08/19/20 09:20am Link  |  Quote  |  Print  |  Notify Moderator

Show us the front and rear axle scale weights of the truck without the trailer, and then the front, rear, and trailer axle weights when hitched without the weight bars hooked up. Then it becomes very easy to calculate the weights.

Charles

Sarge1201

Oregon City, OR

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Posted: 08/19/20 11:14pm Link  |  Quote  |  Print  |  Notify Moderator

Well I weighed it with the WDH hooked up and haven't had an opportunity to get back to the scale. This is what I have

LOADED TRUCK/TRAILER WITH WDH
Truck;
Front axle = 4050
Rear axle = 4360

Trailer;
Front axle = 3300
Rear Axle = 3550

TRUCK WITHOUT TRAILER
Front axle = 4000
Rear axle = 2850

So I'm actually 50 lbs heavier on the front truck axle with the trailer. Might need to drop a link on my WDH chains.

I have a bunk house trailer and the only things behind the axles are the bunks and the bathroom. There is a small storage box (outside access) under the bunks but I don't have much space there.

The reason for the post is that I get sway (true sway) above about 50 MPH so I'm trying to fine tune the WDH. It doesn't seem that my TW is too light but then I need to get my weights with the WDH unhooked to get true numbers.

I'm running LT tires on the truck and Goodyear Endurance on the trailer, both "E" rated and all inflated to 80 lbs. The WDH is the Blue OX Sway Pro 2000.

Sarge1201

Oregon City, OR

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Posted: 08/19/20 11:20pm Link  |  Quote  |  Print  |  Notify Moderator

Now that I'm looking at these numbers, its clear that I need to get to a CAT scale. Its difficult to get good weights from a closed truck scale along the road. My trailer axle weights don't really add up.

Lets just ignore this for now and I'll post a new question after I get more accurate numbers.

ACZL

UPstate,NY

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Posted: 08/20/20 02:22am Link  |  Quote  |  Print  |  Notify Moderator

Sarge1201 wrote:

Now that I'm looking at these numbers, its clear that I need to get to a CAT scale. Its difficult to get good weights from a closed truck scale along the road. My trailer axle weights don't really add up.

Lets just ignore this for now and I'll post a new question after I get more accurate numbers.


Fair enough.

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