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Towing...actually Airstreaming...with a Model X

Discussion in 'Model X: Driving Dynamics' started by jamtek, Jul 2, 2017.

  1. jamtek

    jamtek Member

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    Well standing on the shoulders of giants... @JimVandegriff , @ohmman and others... I've decided to pull the trigger on a 2018 Airstream Bambi Sport 22. I've really enjoyed reading all the Model X/Airstream posts to date, and I so thoroughly enjoy road trips with my Model X that I want to take it to the next level. I intend to pull the Airstream with my Model X 90D with the tow package installed recently by my local SC.

    I'm evaluating different trailer hitch setups at the moment as I have about 6 weeks to get ready before the new Airstream arrives. The three hitch systems I'm looking at are all of the anti-sway variety:

    1. Equal-i-zer

    [​IMG]
    The Equal-i-zer seems to be the tow system of choice thus far among Model X towing pioneers. My only issue is I don't like the way the system relies on pure friction of steel on steel to accomplish the anti-sway function. Another issue is it uses a set of many washers (think stack of coins) to accomplish preangle adjustment on the hitch ball and alter weight distribution. This system seems a little "Rube Goldberg" to me, but I'm not an engineer. The fact that others are using this system on the road without apparent issues means a lot however.

    2. ProPride Hitch

    [​IMG]

    This really is a whole different animal in terms of hitch systems. It may be overkill for a sub 5000 lb trailer but I like the technology employed. The ProPride main unit consists of two 3/4" thick links that project the pivot point of the trailer forward to near the rear axle of the tow vehicle. By not allowing the trailer to pivot side-to-side on the ball, trailer sway is eliminated. The downside here is the increased tongue weight because of the weight of the apparatus itself and the high cost--nearly three times the cost of the Equal-i-zer. Again, this system is really designed for all trailers including very heavy trailers and may represent extreme overkill.

    3. Hensley Cub

    [​IMG]

    Of all the hitch systems I've looked at, this one is my favorite from a technology perspective. The Cub model is specifically designed for smaller trailers (between 2,000 and 6,000 pounds (12 to 24 feet)) and a wide variety of tow vehicles ranging from cars and compact SUVs to pickup trucks. It is the only trailer hitch on the market that doesn't use friction to control sway. It uses a proprietary converging linkage system that effectively allows movement on the ball in every direction except side-to-side. From the company's literature ..."Side-to-side movement is forced to go through the linkage system which is one directional. From the trailer side, the linkage is solid. Pivoting by the linkage must be initiated through the tow vehicle. The system’s design is inherently stable. Best of all, it functions mechanically, without the use of friction so it exhibits consistent and predictable behavior regardless of changes in weather or road conditions." This hitch is supposed to allow the tightest turning radius of any hitch system on the market because of articulation of the linkage around the ball. Interestingly it is supposed to bring the tow vehicle slightly closer to the trailer which reduces wind resistance and may be especially well suited for use with a Model X to improve range a tad. It is about 2 1/2 times the cost of the Equal-i-zer. A good video showing how it works is here...

    Hensley system video

    Sooo...help me decide! Any input from experience towers would be appreciated. Obviously safety in towing is my number one concern so I want to make a good decision here.
     
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  2. ohmman

    ohmman Maximum Plaid Member

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    Consideration should be given to the ease of hitching and unhitching, as you will find the need to do so at most charging stops. We currently get lucky with some less-populated Supercharger sites, but with Model 3 coming I doubt that'll last. I have no specific loyalty to my Equal-i-zer hitch, but I can perform both sides of the hitching transaction in less than 5 minutes. This is helped by my installation of an automatic tongue jack and a flip foot. While the automatic jack is cranking, I will be unhooking the safety chains and the 7-pin adapter. Once I've jacked it up enough to relieve the strain on the torsion bars, I can remove those from the A-frame, drop the tongue back down, release the ball, and jack it back up. I have taken to driving to the Supercharger with the torsion bars still connected to my hitch. It looks funny but it saves some time on both sides of the process.

    Additionally, I strongly suggest replacing the stock receiver on your Model X, or at least reviewing this thread before considering using weight distribution.
     
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  3. jamtek

    jamtek Member

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    I just read your post detailing your hypothesis on the root cause of the stock Bosal hitch adapter loosening. Do you think an articulating antisway hitch like the Hensley is a better way to go? Probably not enough data at this point but I wonder.
     
  4. JimVandegriff

    JimVandegriff Member

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    We are also wondering the same thing. Our neighbor is getting a Hensley hitch for his towing in the next month, and he is a proponent, so we will investigate it when we return from our next Airstreaming/X trip which starts up this week (we will be traveling for two months). I personally am looking forward to Ohmman's report on his draw-tite installation.
    Illijana (my wife) and I both like the equalizer hitch we have. It handles the trailer perfectly and is rock solid in towing (no sway at all). I haven't had experience with the other hitches, so will defer comment and await the experiences of other hitch aficionados.
    You are in for a great adventure! We are loving our X/Airstream experience (well except for the hitch wiggles!) All the best, Jim
     
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  5. jamtek

    jamtek Member

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    Yes...just looked up the Draw-tite install instructions for the Model X and seems well-engineered and straight forward.

    I intend to gather as much data as possible on different hitch systems and I intend to share any useful info with the group.

    Enjoy every minute of your Airstream adventure--looking forward to lots of pics!
     
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  6. ohmman

    ohmman Maximum Plaid Member

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    I believe it's less about the anti sway and more about the rigidity between the vehicles. Most WD hitches will instruct you to remove torsion bars when driving up curbs or on uneven roadways for this reason.

    I haven't looked deeply into the Hensley Cub yet, but it looks like an inventive setup. Hitching and unhitching look to be relatively quick, though I worry a bit about lining up the stinger when backing up. I've found that the air ride on the X doesn't always keep me at exactly the same level. I once backed into my tongue on the trailer despite having not touched it since I drove away. Somehow the X was higher - either the air suspension/auto leveling function or my approach angle made it so I didn't clear. It was a tap, but I could see it being a little tough with that Cub.
     
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  7. ohmman

    ohmman Maximum Plaid Member

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    #7 ohmman, Jul 30, 2017
    Last edited: Jul 30, 2017
    Just an update here. I spent some time last week looking at the Hensley Cub and I do think it's a better choice for the Bosal hitch (though, as I'll point out, still not recommended). I think it's better because you can get anti-sway features regardless of the torque placed on the receiver. The friction-based anti-sway bars resist sway proportional to how much load you put on the torsion bars. With the Hensley, you could theoretically adjust it for zero torque on the X (effectively weight carrying) and still get anti-sway.

    The downside is that the Cub mounts to the tongue and weighs about 150 lbs. So max tongue weight of a trailer is going to be the 500 lb limit by Bosal minus 150 lbs = 350 lbs. That's a pretty low limit, even for light trailers because most published numbers are dry and empty.

    I can't really say how the Cub relates to the offset limits on the Bosal but it does seem to be closer than the Equal-i-zer to their recommendation of no more than 3/4" rise and 8" horizontal offset.

    Edit: An additional note. If the unique rehitching style of the Hensley works with the air ride on the X, it would actually be quite quick for Supercharging stops as well.
     
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  8. guyG

    guyG New Member

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    I towed recently a glider trailer with my Model X 90D. De trailer is 12 m long, 1.8 m high, weights 1300 kg, and has a good aerodynamic shape. After driving 1400 km most on highways @ 90 km/h, I can conclude that my range was reduced by 35% (compared to driving @ 110-120 km/h with our trailer).

    Si this is a significant loss of range but , as far as I am concerned, acceptable ...
     
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  9. guyG

    guyG New Member

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    "without trailer"...
     

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