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Old 10-21-2015, 11:07 PM   #41
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Quote:
Originally Posted by LeonW View Post
And my 2015 Highlander manual says that trailers weighing 5000 lbs or less do not need a WDH. I have always thought that is kind of strange, because it seemed to me that tongue weight would also figure into the equation.
Toyota, like other manufacturers, recommends 10% tongue weight; as a result, a limitation of 500 pounds of tongue weight without WD implies a limitation of 5000 pounds of trailer weight.
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Old 10-23-2015, 02:51 PM   #42
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I wonder if a "weight distribution hitch" really distributes weight. I have used one for many years so I believe in its goodness for leveling the TV and trailer, and for adding control to the rig. But I don't see how adding spring bars that level the rig actually distribute any weight to other axles. I recently stopped on my last trip and had my rig weighed. Here is the result: steering axle: 2560 lbs, drive axle: 3120 lbs, trailer: 3400 lbs. My tow vehicle is a Jeep Grand Cherokee, and the specs say that the weight is distributed 52/48% front to rear. The trailer is an Escape 19, which has a dry weight of 3000 lbs. My tongue weight is about 400 lbs, and the WDH adds about 100 more lbs. Doing the math, the drive axle should be about 2363 lbs without the trailer. (My wife didn't want me to spend any more time weighing, but next time, I would like to unhitch the trailer and reweigh the Jeep to confirm my math.) That means that the extra (tongue?) weight would be about 757 lbs. The Jeep gas tank was full, and I don't know how it is distributed front to rear so that could account for some of the weight. And I was in the car. The total front and rear weight was 5680 lbs which is well under the GVWR of 6500 lbs.

What I don't see is any evidence that any weight was actually distributed from the drive axle to any other axles. What am I missing? Or am I right that no weight is actually distributed as my engineering mind is telling me?
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Old 10-23-2015, 03:13 PM   #43
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etrailer.com is a great place to find RV answers.
In this video at 4:51 is answer to question "how WDH works"

https://www.etrailer.com/tv-weight_d...ution_faq.aspx
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Old 10-23-2015, 04:51 PM   #44
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Quote:
Originally Posted by bdornbush View Post
I wonder if a "weight distribution hitch" really distributes weight. I have used one for many years so I believe in its goodness for leveling the TV and trailer, and for adding control to the rig. But I don't see how adding spring bars that level the rig actually distribute any weight to other axles. I recently stopped on my last trip and had my rig weighed. Here is the result: steering axle: 2560 lbs, drive axle: 3120 lbs, trailer: 3400 lbs. My tow vehicle is a Jeep Grand Cherokee, and the specs say that the weight is distributed 52/48% front to rear. The trailer is an Escape 19, which has a dry weight of 3000 lbs. My tongue weight is about 400 lbs, and the WDH adds about 100 more lbs. Doing the math, the drive axle should be about 2363 lbs without the trailer. (My wife didn't want me to spend any more time weighing, but next time, I would like to unhitch the trailer and reweigh the Jeep to confirm my math.) That means that the extra (tongue?) weight would be about 757 lbs. The Jeep gas tank was full, and I don't know how it is distributed front to rear so that could account for some of the weight. And I was in the car. The total front and rear weight was 5680 lbs which is well under the GVWR of 6500 lbs.

What I don't see is any evidence that any weight was actually distributed from the drive axle to any other axles. What am I missing? Or am I right that no weight is actually distributed as my engineering mind is telling me?
You are overthinking things and considering too much non-relevant information. Firstly, when your tow and trailer are connected and the WDH properly hooked up, the spring bar type of WDH does work to redistribute weight from the hitch to the front wheels of the tow and also back to the trailer wheels. Calculating how this is done is a relatively straight forward process using statics (but I will not go through it here).

To see how it works in practice, connect your tow and trailer but do not use the WD spring bars, and then weigh each of the axles of your tow and trailer. Then, hook up the WD spring bars and re-weigh each of the axles. If your WDH was connected correctly, you will see an increase in front axle weight and trailer axle weight and a decrease in the rear axle weight of your tow vehicle.
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Old 10-23-2015, 11:17 PM   #45
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Originally Posted by bdornbush View Post
What I don't see is any evidence that any weight was actually distributed from the drive axle to any other axles. What am I missing?
Yes, a "weight distribution" system really does force the tug's front axle and the trailer's axle(s) to carry more load, and the tug's rear axle to carry less. The constraint is that the effective location of the net force must stay in the same place, and that determines the split between the tug's front axle and the trailer's axle. This has been demonstrated many times by people running their rig over a scale with and without WD.

I don't know how the math was done with the provided numbers, because they are not complete - perhaps some data just wasn't mentioned in the post. The total of trailer and tug is 2560 + 3120 + 3400 = 9080 pounds; however, we have no way to know, without weighing the tug and/or trailer separately, how much of that is tug and how much is trailer... so there is no way to know what the tug's rear axle would carry without the trailer, or with the trailer and without the WD hitch.

If you want to get further into this, start another thread and I'll respond with more detail. I already have some written, but it probably doesn't belong in this thread.
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Old 03-20-2016, 10:44 AM   #46
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Back to 17 versus 19. Can someone tell me if the size of the bathroom in the 19 and the 17B is the same, or is the 17B's bathroom smaller?
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Old 03-20-2016, 10:49 AM   #47
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The bathroom in the 17b is smaller. When we were looking, I found I could not stand up in the 17b while I could in the 19. We bought a 19.
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Old 03-20-2016, 10:53 AM   #48
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Found the specs, and it says the 17B bathroom is 3" narrower. I was wondering why they made the bathroom in the 19 wider. That 3" might be a huge difference for getting into the dinette. Anybody out there that put a narrower bathroom in the 19 then the standard?
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Old 03-20-2016, 10:55 AM   #49
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You have no choice of bath size, as they a moulded to fit each particular model.
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Old 03-20-2016, 10:58 AM   #50
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If you are concerned about bath size, the Escape 21 has the largest of all the models offered.
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