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Old 05-19-2015, 11:39 AM   #1
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Equalizing Hitch and Audi Q7 TDI

I have a 2015 Audi Q7 TDI with factory installed tow package. I am considering buying a 25FB which actually weighs 1000 pounds less than my 26' boat. the tongue weight is 200 lbs more on the 25FB than the boat. I know I will need an equalizing hitch but am confused about the ratings. I know that they transfer about 30% of the tongue weight which makes it fall within the range listed on the hitch (662 WT Distributing, 662 WT Carrying). So would this be the rating before the 30% distribution or after? The dry tongue weight is listed as 837 on the 25FB. Very confused, help!
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Old 05-19-2015, 01:04 PM   #2
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A WD hitch does not transfer a given % of weight or a given number of lbs. The resulting transfer is a result of how the hitch is set up and that set up is dictated by the geometry of the trailer and TV. No two rigs are the same and do not be talked into "what my set up is or I drop 4 links". Search the AirForum or the Audi forum for those that may be towing with your TV and geta ball park idea of what to do.

What you want is a hitch that will result in the front axle of the TV returning to or close to the original fender height. This ensures that the steering geometry is within specs for the TV. Not returning the front axle to this will result in poor steering control and most likely sway issues.

Keep in mind that setting up a WD hitch is not a 5 min. job and 90% of the dealers out there have no idea of how to set one up. I had one dealer that said he had set up my daughter's trailer without even having the TV and the TV hitch parts on hand and only wanted $120.00 for doing it. Needless to say he did not get the $120.00 and I reconfigured the hitch before we left his lot
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Old 05-19-2015, 01:23 PM   #3
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There's an ongoing discussion about your specific type of tow vehicle right here. You will find it informative, and give you some good contacts for help.

http://www.airforums.com/forums/f463...rs-134917.html

Here is another.

http://www.airforums.com/forums/f449...er-129709.html

cheryl
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Old 05-19-2015, 04:35 PM   #4
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Am I right to assume that, if correctly set up, a proper hitch will lower the tongue weight of the trailer some?
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Old 05-19-2015, 04:53 PM   #5
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Am I right to assume that, if correctly set up, a proper hitch will lower the tongue weight of the trailer some?
A correctly set up weight distributing hitch will reduce the effect of the tongue weight some. In terms of tow vehicle axle loads, that effective reduction means that a small portion (ie 25% or so) will be carried by the trailer instead of the tow vehicle. It isn't actually reduced in terms of the forces applied, which matters for loading on the receiver in terms of its design rating. Hence the reinforcement that is frequently done.
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Old 05-19-2015, 06:14 PM   #6
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Am I right to assume that, if correctly set up, a proper hitch will lower the tongue weight of the trailer some?
No. Nothing can reduce the tongue weight. What can be done is that load can be transferred from the bumper area, and thus the rear TV axle to the front axle of the TV and to the axles of the trailer. If you were to weigh the rig before and after a WD hitch was install the total would be to same plus the weight of the hitch assembly.

How much is transferred if a function of several things. The length of the TV and trailer, the load placed on the bars, and general spring strength of the TV. There is no single % that can represent this.
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Old 05-19-2015, 07:36 PM   #7
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Interesting stuff. I looked at the hitch rating on a Chevy 1/2 ton truck. It stated Max load 600#, with WD 1000#. How could that be if the tongue weight does not change? On my Audi both numbers are the same, 662#. Confusing!!!
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Old 05-19-2015, 08:48 PM   #8
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Interesting stuff. I looked at the hitch rating on a Chevy 1/2 ton truck. It stated Max load 600#, with WD 1000#. How could that be if the tongue weight does not change? On my Audi both numbers are the same, 662#. Confusing!!!
Presumably the limiting factor in that specific case is rear axle loading, which the weight distributing hitch helps with (if it is set up correctly)
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Old 05-19-2015, 09:53 PM   #9
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Interesting stuff. I looked at the hitch rating on a Chevy 1/2 ton truck. It stated Max load 600#, with WD 1000#. How could that be if the tongue weight does not change? On my Audi both numbers are the same, 662#. Confusing!!!
It may have to do with how the load on the rearward portion of the hitch and the truck frame. In the case without a WD hitch that load is concentrated on this section of the receiver. With a WD hitch and the rotational force generated by the WD bars that load is reduced and more applied to the front bolts.

While these cracks in a GM receiver occurred with a WD hitch it may have been much worst without one.
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Old 05-20-2015, 11:50 AM   #10
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I have a 2015 Audi Q7 TDI with factory installed tow package. I am considering buying a 25FB which actually weighs 1000 pounds less than my 26' boat. the tongue weight is 200 lbs more on the 25FB than the boat. I know I will need an equalizing hitch but am confused about the ratings. I know that they transfer about 30% of the tongue weight which makes it fall within the range listed on the hitch (662 WT Distributing, 662 WT Carrying). So would this be the rating before the 30% distribution or after? The dry tongue weight is listed as 837 on the 25FB. Very confused, help!
Call Andy Thompson of Can-Am Trailers in London. he is the expert on hitches and airstreams.
Jim
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Old 05-20-2015, 12:46 PM   #11
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WD hitches place MORE stress upon receivers, Howie..... Not less.
That crack is in a radius which may have cracked regardless..... but contrary to popular thought, WD hitches are NOT cure-alls. A properly distributed load does not require a WD hitch at all, .... and if done well, is preferable.
WD hitches should be recognized for what they are.....Band Aids...compromises, which have their own unique complications, and many so-called"experts" know little of what they profess to critique.
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Old 05-20-2015, 02:30 PM   #12
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A properly distributed load does not require a WD hitch at all, .... and if done well, is preferable.
WD hitches should be recognized for what they are.....Band Aids...compromises, which have their own unique complications, and many so-called"experts" know little of what they profess to critique.
As every combination is different and so are the requirements to optimize balance, control, and stability. Many believe the WDH is a well designed, well thought out piece of gear. Most of us would not leave home without one.
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Old 05-20-2015, 03:43 PM   #13
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A properly distributed load does not require a WD hitch at all, .... and if done well, is preferable.
That's a dangerous, and incorrect, generalization.
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Old 05-20-2015, 08:58 PM   #14
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Well, thanks for everyone's input. I just purchased the 2015 25FB so I will have to figure it out. I will contact the CanAm guy, but in the meantime I will try to rebalance by moving the batteries and spare tire. I am going to use the Blue Ox system. I spoke with a guy that owns a Porsche Cayenne Diesel. It is built on the same platform as my Q7 TDI and has the same hitch. He has been towing a 27FB for a year and a half now with no problems. Wish me luck!
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