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Old 07-18-2014, 12:28 PM   #15
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Hi Phil,
I am dealing with the same questions. Let me know if you get any good answers!.
Mike
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Old 07-18-2014, 12:53 PM   #16
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When weighing get the towing hitch weight by pulling the truck onto the scale with the Airstream attached and weight distribution set, but behind the scale. Then disconnect the hitch and weigh the truck alone. The difference is the amount of payload the Airstream adds to the truck so you can see if the truck is rated high enough to carry your Airstream's weight, as well as the weight on each truck axle.

The pull the while rig onto the scale and see what you have as a combination and the trailer itself.

The expert on Airstream towing combinations is Andrew Thomson at Can Am Airstream in London, Ontario. Call them for good advice.
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Old 07-19-2014, 01:49 PM   #17
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Thanks for all your advice. Today we weighed the whole rig: Tell me what this means to you:

Disconnected:
Yukon front 3720, rear 3600, total 7320
Airstream wheels 8820, tongue 1720, total 10540 (Includes Hensley hitch)

Connected without weight distribution:
Yukon front 2840, rear 5440, total 8280
Airstream wheels 9180

Connected with weight distribution:
Yukon front 3160, rear 5160, total 8320
Yukon front is lighter by 560 lb than solo; rear is 1560 lb heavier than solo
Yukon front is heavier by 320 lb than without WD; rear is 280 lb lighter than w/o WD
Airstream wheels 9140

My conclusions: Tongue weight is WAY above what Airstream advertises, weight distribution is working, but inadequate - we still need 800 lb or more thrown forward from the rear.

Your thoughts?

Thanks
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Old 07-19-2014, 02:01 PM   #18
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It appears the airstream hitch weight is too heavy for the weight distribution system and the truck and it's receiver. Again call Andrew Thomson at Can Am, he's most probably seen this many times.
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Old 07-19-2014, 08:10 PM   #19
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With 1720# on the jack, you are probably exceeding the hitch rating as well.


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Old 07-22-2014, 06:41 PM   #20
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But on the bright side, better to be informed than in the dark...
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Old 11-05-2014, 10:26 AM   #21
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As this thread has to do with OP's later thread on best WD hitch:

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, 07:08 PM   #22
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Slowmover: I don't get your calculation of Tongue Weight equaling TV without Weight Distribution minus TV alone. I get 9,180-7,320=1,860; When I weighed just the trailer sitting on the tongue jack I got 1,720; either one is way different than the 960 you calculated...

I did make all these weights at the same time. I went back again at a later date to verify and several of the first few measurements were the same, so I didn't continue to do them all.

I have since determined that my OEM hitch receiver from GMC is rated at only 1,500 lbs, so I am in the process of purchasing and installing a Curt hitch receiver with 2,400 lb rating. We'll see if it makes any difference...
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Old 11-05-2014, 07:11 PM   #23
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Stiffer suspension?

Read through the way the chart is arranged. Cross checks. Did I accidentally change the scale numbers? If not then the TW is as shown.

Is your TW really 19%? 9% doesn't seem right either.


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