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Old 10-28-2014, 07:41 PM   #15
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You should recheck the tongue weight as 1700 seems high.
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Old 10-28-2014, 08:39 PM   #16
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Phil, the OP didn't say, but if it's the long couch slide, it could weigh that much.
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Old 10-28-2014, 08:41 PM   #17
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My 35' SOD Classic with 2 40# bottles, 4 AGMs, and a Hensley Arrow weighs 1,750# on the CAT scales. He needs an after market Class 5 receiver as the GM hitch has too much twisting flex to allow the spring bars to properly distribute the weight. I have towed mine about 60,000 miles, including a round trip to Fairbanks, Alaska. Just recently, because of wear, Hensley took back my hitch and sent me a new one for gratis under their lifetime warranty. They had already replaced all the moving wear parts. All I have paid is shipping. I am convinced in the long run for safety (no possible sway) and durability you can't beat the Henley. And, this time of year the put them on sale.
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Old 10-28-2014, 09:30 PM   #18
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The OP's answer... "The hitch you own" is the answer. Just like choice to be a CARETAKER for an AS.. It is up to you to drive and operate.

With AS, unless you are driving a far outclassed TV (tow vehicle) like a Freightliner, or 3500-4500 dually truck, you may want to consider 'Weight distribution'. Also, consider 'sway' of a towed trailer... do you want to "manage" or "eliminate" it?

Once you have those two questions answered, you need to start getting some hard numbers on your trailer weight and it's tongue weight when "ready to camp"... with all your 'personal' needs aboard. That will take 'scales' to figure it out.

You will need to know the 'loaded' height of your TV too... so you can purchase the correct 'receiver insert'..which is adjustable to your TV and AS heights.

Then you get a 'weight distribution' hitch to match your needs. If you have a 1000# tongue load, you will be transferring some of that weight TO your TV... ergo "weight transfer hitch". There are different thoughts on the 'tongue weight' as well. Do you figure tongue weight as 10 or 50% of the trailer curb weight? Here Determining Trailer Tongue Weight | etrailer.com they state 10-15% of the Trailer weight should be the 'tongue weight'.. therefore a 5000# trailer could have as little as 500# or 750#. How much do you 'distribute' to your tow vehicle?

Some say 1/3-1/3-1/3 is optimum. In general this is correct... there are always 'variables'.. so, you would want to have say between 1/3 and 1/6 of the Tongue Weight transferred to the TV FRONT tires..if you read all the available info, you can decide for yourself.

For my rig I set it up where the front and rear suspension 'settles' to within 1/8" with the front settling less when loaded.. This gives me a very stable ride. If you 'crank up' the WD bars to try to transfer MORE to the front, you will find the steering to be uncomfortable.

You just have to 'set' within specs, what works best...

After all this, you see, it comes down to the hitch YOU choose to work with.

Regarding 'sway'... I won't re-explain what it is.. that has been done already.. what I ask is, "do you want to 'manage' or 'eliminate' sway'. That is where 'hitch design/choice' is most important.

We run a new ProPride 3P. yes, it is crazy expensive. Yes, it can 'eliminate' sway from all I have seen.... so can the Hensley... but, like all things, there is no 'perfect' solution. Life has too many options and variables... but, if you research the physics, the PP and Hensley seem to have the ability to 'eliminate' sway in most operating situations...
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Old 10-29-2014, 12:28 AM   #19
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Howie.

What's your theory?

Andy
I'm not sure, but I think Howie's theory might well be that he is a lot smarter than the rest of us uneducated dolts. Maybe he's right, but I don't think so.

But then again, maybe I'm too slow to understand it.

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Old 10-29-2014, 09:29 AM   #20
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It is not my theory, I yield to Archimedes. He figured it out long before the WD hitch.

Yes indeed, that formula works.

But it's for a single pivit point, not two as we have with tow vehicles.

And then, it's only for vertical, not horizontal.

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Old 10-29-2014, 10:39 AM   #21
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It is not my theory, I yield to Archimedes. He figured it out long before the WD hitch.

Howie.

My records show that your Airstream should have 4000 pound axles with 12 inch bakes.

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Old 10-29-2014, 09:40 PM   #22
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It really doesn't matter whether a "1/3,1/3,1/3" distribution is possible.

What does matter is -- adding a load equal to 1/3 of tongue weight to the front axle significantly increases the tendency for oversteer which can lead to loss of control.

Ron
In practice or theory?

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Old 11-05-2014, 10:30 AM   #23
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(From earlier thread)

Connected with weight distribution:
Yukon front 3160,
rear 5160
TT 9140

Connected without weight distribution:
Yukon front 2840
rear 5440
TT 9180

Disconnected:
Yukon front 3720,
rear 3600



[Ron Gratz Chart]

Weighing #1 -- TT attached and Weight Distribution Activated
Let Front Axle Load be "FA1" 3160
Let Rear Axle Load be "RA1" 5160
Let TT Axles Load be "TT1" 9140

Then, while in same position on scales, take
Weighing #2 -- TT attached and Weight Distribution Not Activated (WD bars unloaded, but hanging in place)
Let Front Axle Load be "FA2" 2840
Let Rear Axle Load be "RA2" 5440
Let TT Axles Load be "TT2" 9180

Then, drive off scales and drop TT. Return to scales and take
Weighing #3 -- TV only -- TT Not Attached
Let Front Axle Load be "FA3" 3720
Let Rear Axle Load be "RA3" 3600

From the above values, you can calculate:

TV weight = FA3 + RA3 7320

Gross Combined Weight = (FA1 + RA1 + TT1)
{should also be equal to (FA2 + RA2 + TT2) if scale weights are correct}

17,460 & 17,460

TT Weight = Gross Combined Weight - TV Weight

10,140

Tongue Weight = (FA2 + RA2) - (FA3 + RA3)

8280 - 7320 = 960

Load Transferred to TT Axles
when WD System is Activated = TT1 - TT2 40


Something is off somewhere (TW, mainly. 12% of 10,140 is 1215-lbs as example). Were the readings all done at the same time?


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Old 11-05-2014, 12:01 PM   #24
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Wow, 1,700 lbs. hitch weight!

I would imagine that the suspension on any tow vehicle capable of safely handling that amount of hitch weight (while leaving sufficient payload capacity for the cargo and the spouse) would have such a stiff suspension that moving some of the hitch weight forward with a conventional WD hitch would be a real challenge.

Our Airstream has about half that hitch weight, and I have a 2015 Ford-F-250 with the crew cab and long bed and our 1,200 Reese bars are barely adequate to move sufficient weight to the front wheels.
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Old 11-05-2014, 12:05 PM   #25
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Originally Posted by AnnArborBob View Post
Wow, 1,700 lbs. hitch weight!

I would imagine that the suspension on any tow vehicle capable of safely handling that amount of hitch weight (while leaving sufficient payload capacity for the cargo and the spouse) would have such a stiff suspension that moving some of the hitch weight forward with a conventional WD hitch would be a real challenge.

Our Airstream has about half that hitch weight, and I have a 2015 Ford-F-250 with the crew cab and long bed and our 1,200 Reese bars are barely adequate to move sufficient weight to the front wheels.
Actually, the longer the wheelbase of the tow vehicle, the more difficult it is for the weight distribution hitch to return the weight to the front axle, and conversely, the shorter the wheelbase of the TV, the easier it is.

Your F250 has one of the longest wheelbases of the popular tow vehicles.
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Old 11-05-2014, 12:23 PM   #26
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Thanks, Steve. That is exactly what Andy Thompson said when he set up our hitch. But I still like towing with the long wheelbase vehicle, smooth as a baby's behind! But the real reason we have the long bed is to accommodate two road bikes and two mountain bikes along with some typical camping gear.

I still can't get over the OP's 1,700 tongue weight!

What is a "six cylinder sludge burner?" Surely your 2500 has a V-8? Did you get it neutered?
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Old 11-05-2014, 12:34 PM   #27
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My 2500 is a Dodge Ram with the I6 6.7L Diesel.

Yes, that 1,700 pounds sounds a little high as my '34 SO is only around 1200lbs measured on a Sherline. I too have a hard time getting the front axle load returned to unhitched weight with 1200 pound bars, or let's say it's all I want to lift getting the bars onto the Reese SC hitch. But, I like the simplicity and performance of the hitch.

As you probably know, there is one person active on this forum who would advocate that I use 600lb bars, or some such BS, but I think he makes at least part of his living selling hitches and bars.

The thing is, 1200lbs is just as difficult to distribute properly behind a 2500 as behind a Cadillac, and maybe even more difficult because of the wheelbase. 1200lbs is 1200lbs, a fact.
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Old 11-05-2014, 12:43 PM   #28
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The scale figures show 960-lb TW


Sent from my iPhone using Airstream Forums
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