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Old 01-04-2019, 07:57 PM   #1
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Real world tongue weight numbers- step inside!

Forums and Youtube can be fantastic sources of information...its up to the reader to determine if its factual or not. Forums and youtube is also a great place for bad advice or added confusion. The question that seams pretty consistent is how tongue weight is figured and how weights within the trailer effect that. I had the same questions for my own TT as I determine needing to purchase a heavier truck or not. I decided to order a tongue weight scale and do testing of my own to see not only the exact weights of my TT, but also how shifting weight within the trailer helps or hurts it.

I have the luxury of being able to test 2 Rockwoods. Mine is a 2905ws and my mothers is a 2506s. (see pictures below of family shot!)



There is always confusion of what is included in the TW as listed on the publications. FR has always indicated that the TW listed includes the (2) 30 lb tanks (empty) and no battery. Many people have argued this. I think the results of my scale test might surprise people. It certainly did me.

First off, the 2905ws:
Posted empty weight is 6,975 lbs on my door sticker. Published TW is 834 lbs. There was about 300 lbs loaded in the trailer. Most of that was in front of the axles, specifically in the front storage pass through and kitchen area. The rear of the TT has about 60 lbs worth of lawn chairs and random things.
Total weight of the tested rig is right around 7,275. When traveling, food would be added to the pantry and fridge, which sits over the axles. I would not expect much TW change, due to the experiment you will see.





I ordered a Sherline 2000 lb scale off of Amazon.

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Old 01-04-2019, 08:03 PM   #2
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So here is the result for the first camper....

(I will add both 30lb tanks are mostly full)



As you can see, it is about 850 lbs. Again, advertised TW is 834. I lowered it, rest it and did it multiple times. Each were right around 850 lbs. This works out to be right around 12% of the trailer weight.
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Old 01-04-2019, 08:16 PM   #3
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I then decided to see how adding additional weight effected the loading. I used myself as the added weight. I weight about 225 lbs. I placed my phone on the tongue and recorded the scale while I went inside the trailer. I first stood in the front bedroom. As you can see in the video it increased to about 1000 lbs TW. So about 67% of my weight was added to the tongue in the bedroom. I then walked to the back and stood in the bunkhouse. You can see all of the weight shifted and reduce the TW to just below 850 lbs, probably about 825 lbs.
This information is useful when knowing how to load the trailer. It tells me I can add quite a bit of weight to the middle and rear when loading and still keep my TW at 12% -ish and not adding additional to the truck.

Here is the video of the scale reading.

https://youtu.be/dHY63yJCc2M
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Old 01-05-2019, 01:57 AM   #4
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Images arent working above. Here they are:





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Old 01-05-2019, 07:11 AM   #5
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This is very interesting. Does the grass absorb some weight? Maybe test on concrete?
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Old 01-05-2019, 08:09 AM   #6
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Good thought but the ground is frozen currently.
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Old 01-05-2019, 09:57 AM   #7
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Quote:
Originally Posted by Mch5jdm View Post
This is very interesting. Does the grass absorb some weight? Maybe test on concrete?
Makes no difference whether you're on a hard surface or soft surface. As long as the force isn't accelerating or decelerating, the weights will be the same.
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Old 01-05-2019, 11:45 AM   #8
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I watched your video and the lowest reading is about 880 lbs.
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Old 01-05-2019, 11:48 AM   #9
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I plan to do similar this year. But I'm too CHEAP to buy that scale
Just bought a new bathroom scale and will use the old one with a lever setup for tongue weights. Got to be extra careful. It appears they no longer make those all metal spring scales. They are all digital with GLASS tops. I'll have to use a plywood sheet for a base on the scaling rig.
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Old 01-05-2019, 12:05 PM   #10
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I have a Sherline scale as well. My tongue weight is at 780# with full water tank. Advertised tongue weight is 635#.


Sherline scale is an awesome tool. Very inexpensive for the value and ease of it.

Weighing on grass will give you the exact measurement as doing it on concrete. Like the previous poster said, if it's not accelerating or decelerating, it will be the same. High school physics!
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