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Old 05-08-2014, 12:44 PM   #31
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If your tongue weight does cause rear end sag, then an Andersen w/d witch would be the answer, not only does it shift weight forward, it also alleviates sway.
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Old 05-08-2014, 01:20 PM   #32
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What factors would indicate whether a Timbren (or other brand) kit or air bags would be the better choice to address rear-end sag? And how much sag is too much? cpaharley said that he had a 1-inch sag with his Ram while towing the 21 but wasn't concerned about it. When to worry? And would the answer depend on the vehicle and trailer combination? Can other actions safely mitigate sag w/o lightening the hitch weight too much? TIA.
If the trailer hitch weight causes significant unloading of weight from your front axle on the tow vehicle (and you will often be able to determine this from the feel of your vehicle while driving), then a Weight Distribution Hitch may be an appropriate solution. If the trailer hitch weight causes sag of the rear end of your tow vehicle with no significant unloading of weight from the front axle, then air bags or otherwise beefed up rear suspension may be an appropriate solution.
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Old 05-08-2014, 02:00 PM   #33
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What factors would indicate whether a Timbren (or other brand) kit or air bags would be the better choice to address rear-end sag? And how much sag is too much? cpaharley said that he had a 1-inch sag with his Ram while towing the 21 but wasn't concerned about it. When to worry? And would the answer depend on the vehicle and trailer combination? Can other actions safely mitigate sag w/o lightening the hitch weight too much? TIA.
I went with airbags on my Sienna but was disappointed with air leakage and tubes disconnecting. Had a set of Timbren Rubber Springs installed and voila, no more problems and rear end sagging alleviated. Because the Sienna has coil springs, they are not easily installed. Glad had the RV guy do it.
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Old 05-08-2014, 04:13 PM   #34
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My old Ford Ranger was rated for just under 6000 lbs towing and 1300 lbs payload. When loaded up the hitch weight was 600. Hooked up with a 600 lb Equalizer WDH I could not get the rear end to come up any where near level, even cranking down the WDH as much as it would go. Rear Air-Lifts brought up the rear of the truck to be level with the front. Can't say it rode better after as it wasn't bad before the lifts, but it looked better and there was less chance of bottoming out the leaf springs or the hitch shank. I kept the air pressure somewhere around 5lbs unless I was going to tow. The trailer is 3550 lbs loaded.
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Old 05-08-2014, 05:08 PM   #35
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Here is the method I use to measure drop with the vehicle empty and parked level and then with the trailer hooked and the vehicle as close to travel weight as possible, I try to include passengers but I found it hard to do the measurements while seated in the drivers seat.
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File Type: jpg Measuring Drop.jpg (43.4 KB, 36 views)
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Old 05-08-2014, 06:08 PM   #36
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I went with airbags on my Sienna but was disappointed with air leakage and tubes disconnecting.
I'm guessing that was with Firestone Coil-Rite bags, like I have. They use a convenient push-in hose connection, which seals with an o-ring. Air-Lift 1000 bags are similar, but their fittings a screw-in, which is less convenient but probably more secure.

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Because the Sienna has coil springs, they are not easily installed.
The installation with coils is certainly easier than with leaf springs, since the bags are just stuffed into the coil while the leaf-spring setup requires the installation of top and bottom brackets. Some people have struggled to get the bags into coils, other have found it trivial; it took me a few minutes to get the bags themselves into my Sienna, just following the instructions.

I'm glad I didn't let any "RV tech" touch my van, and I doubt the truck accessory place that sold the air bags to me would be particularly trustworthy. I'm always suspicious of the competence of automotive service companies, based on my experience.

In the case of any air suspension, of course, there is also the installation of air lines and fill fittings, in addition to the bags themselves.
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Old 05-08-2014, 06:53 PM   #37
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Once again I posted bad information. Here is the correct info on my hitch:

Curt Round Bar Weight Distribution Hitch
Model 17001
10,000 lb. gross trailer weight
800 lb. tongue weight

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Old 05-09-2014, 12:50 PM   #38
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Quote:
Originally Posted by cpaharley2008 View Post
If your tongue weight does cause rear end sag, then an Andersen w/d witch would be the answer, not only does it shift weight forward, it also alleviates sway.

Thanks Jim.
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Old 05-09-2014, 12:52 PM   #39
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Originally Posted by ice-breaker View Post
If the trailer hitch weight causes significant unloading of weight from your front axle on the tow vehicle (and you will often be able to determine this from the feel of your vehicle while driving), then a Weight Distribution Hitch may be an appropriate solution. If the trailer hitch weight causes sag of the rear end of your tow vehicle with no significant unloading of weight from the front axle, then air bags or otherwise beefed up rear suspension may be an appropriate solution.
Thanks Dave. Makes sense.
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Old 05-09-2014, 12:53 PM   #40
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Quote:
Originally Posted by nealmccarter View Post
I went with airbags on my Sienna but was disappointed with air leakage and tubes disconnecting. Had a set of Timbren Rubber Springs installed and voila, no more problems and rear end sagging alleviated. Because the Sienna has coil springs, they are not easily installed. Glad had the RV guy do it.
Didn't think about air leakage. Important point. Thanks Neal.
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