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Old 12-13-2013, 12:27 AM   #71
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BTW,
The rental TV is an F150.
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Old 12-13-2013, 02:06 AM   #72
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Where did you find a place to rent a TV? I have been liking for a winter trip rental...
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Old 12-13-2013, 03:07 PM   #73
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Air suspension does not transfer weight like WDH

Rostam,

I am responding you your comments "Air suspension raises the rear of the TV. This transfers weight on axles, in a similar way to WDHs, and levels the vehicle" and "If you lift the back of the car (via air suspension, WDH bars, or even by hand), the effect is the same".

Actually, air suspensions and WDH hitches have significantly different affects on the vehicle. WDH imparts a rotational force on the tow vehicle, rotating around the hitch. Air suspension expands the suspension of the vehicle in the vertical direction, but makes almost zero change in the forces involved.

I have an SUV with auto-adjusting air suspension in the rear, and I have weighed it at the scales. Here is what I found.

Tow vehicle only, with driver and passenger: 3080 on front axle, 3040 on rear.

Then I hitched the trailer without the WDH bars. I waited for the air suspension to raise the vehicle to its normal height, then weighed again:
2600 on front axle, 4420 on rear axle, 5160 on trailer axles. That rear axle weight is 220 pounds over the manufacturer's stated weight rating.

Then I connected the WDH bars, waited again for the air suspension to stabilize, and weighed again:
3000 on front axle, 3880 on rear axle, 5300 on trailer axles.

So weight distribution really changes the axle loadings.


Note that this trailer is a 25FB. The tongue weight was about 900 pounds on this day.
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Old 12-13-2013, 03:37 PM   #74
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Thank you for posting those real numbers, that's very interesting.
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Old 12-13-2013, 03:39 PM   #75
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I am dreaming about buying a used Porsche Cayenne as a tow vehicle.
What will I have to do to make it so?
Does anyone have experience towing with a Cayenne?
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Old 12-13-2013, 03:40 PM   #76
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Another major advantage of a properly adjusted weight distribution hitch is in performance. Spring bars transfer weight in the direction they're pointed. If you have the hitch ball tilted toward the trailer the inner spring bar unloads when you corner and the outer bar transfers all the weight toward the INSIDE edge of the tow vehicle. It actually causes the tow vehicle lean into a corner, but this performance advantage only occurs if the hitch ball is properly tilted (Step 1 in the EaZ-Lift setup instructions).
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Old 12-13-2013, 04:20 PM   #77
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"Then I connected the WDH bars, waited again for the air suspension to stabilize, and weighed again:
3000 on front axle, 3880 on rear axle, 5300 on trailer axles.

So weight distribution really changes the axle loadings.


Note that this trailer is a 25FB. The tongue weight was about 900 pounds on this day."



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Old 12-13-2013, 11:28 PM   #78
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Quote:
Originally Posted by crabbey1 View Post
Where did you find a place to rent a TV? I have been liking for a winter trip rental...
Bay Area airstream, where we got our AS.
Very happy with them.
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Old 12-13-2013, 11:31 PM   #79
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Quote:
Originally Posted by SSquared View Post
Rostam, I am responding you your comments "Air suspension raises the rear of the TV. This transfers weight on axles, in a similar way to WDHs, and levels the vehicle" and "If you lift the back of the car (via air suspension, WDH bars, or even by hand), the effect is the same". Actually, air suspensions and WDH hitches have significantly different affects on the vehicle. WDH imparts a rotational force on the tow vehicle, rotating around the hitch. Air suspension expands the suspension of the vehicle in the vertical direction, but makes almost zero change in the forces involved. I have an SUV with auto-adjusting air suspension in the rear, and I have weighed it at the scales. Here is what I found. Tow vehicle only, with driver and passenger: 3080 on front axle, 3040 on rear. Then I hitched the trailer without the WDH bars. I waited for the air suspension to raise the vehicle to its normal height, then weighed again: 2600 on front axle, 4420 on rear axle, 5160 on trailer axles. That rear axle weight is 220 pounds over the manufacturer's stated weight rating. Then I connected the WDH bars, waited again for the air suspension to stabilize, and weighed again: 3000 on front axle, 3880 on rear axle, 5300 on trailer axles. So weight distribution really changes the axle loadings. Note that this trailer is a 25FB. The tongue weight was about 900 pounds on this day.
Very useful information.
What kind of hitch are you using?
What is the TV?
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Old 12-14-2013, 12:38 AM   #80
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Tow vehicle details

Knuff,

My tow vehicle is a 2010 Yukon Denali (short wheelbase). The numbers I quoted were when we had a Blue Ox SwapPro hitch. Using that hitch, we experienced a little sway from time to time, enough that we decided to change hitches. The Yukon requires a fairly large drop (the receiver is in the bumper), and the receiver flexes somewhat, which I think messes up the geometry for the Blue Ox.

We had Can-Am reinforce the hitch, and install an EazLift hitch. The rig is more stable now. Andy T. has us set up with heavier bars and more weight transfer. On this vehicle, you can feel the difference when you change the tightness of the chains--more chain tension increases stability going down the road.

I don't have experience with the more sophisticated SUVs like the VW, Porsche, and BMW, so I wouldn't recommend hitch brand or target weights based on my experience.
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