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Old 07-29-2014, 04:29 PM   #71
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Originally Posted by JimGolden View Post
---A travel trailer's CG should be 10-15% ahead of the center line of the axle group. So if you have a single axle, measure the length of the trailer, multiply by .125, and measure forward from the center of the axle.---
Instead of, "measure the length of the trailer", did you mean to say, "measure the distance from the ball coupler to the center of the axle"?

Tongue weight is equal to trailer weight TIMES distance from CG to axle(s) center DIVIDED BY distance from ball coupler to axle(s) center.

Tongue weight ratio is equal to distance from CG to axle(s) center DIVIDED BY distance from coupler to axle(s) center.

The 10-15% rule of thumb pertains to tongue weight ratio.

Ron
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Old 07-29-2014, 05:02 PM   #72
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Ron,

I'd actually meant the length of the trailer. But, you also factor in the length you mentioned.

Say you have a 30 ft tandem axle trailer.
The center between the two axles is located 18' from the ball.
Say it weighs 10,000lbs loaded and ready to go.

Where do you want the CG? It should be 10-15% of the length of the trailer ahead of the centerline of the axles. So 10 to 15% of 30' would be 3' to 4.5' ahead of the CL between the axles.

So, we want the CG to be located at 18' - 3' = 15' behind the ball as the rear most limit, and 18' - 4.5' = 13.5' behind the ball as a happy forward limit.

Do the moment calculation from the CL on it and get something like:
10,000lbs * 3 ft = tongue weight * 18 ft ==> tongue weight = 1667 lbs.

10,000lbs * 4.5 ft = tongue weight * 18 ft ==> tongue weight = 2500 lbs.

Both of these seem a bit heavy, and my geometry here is probably slightly off from a real trailer.

But if we use only the wheel CL to ball length like you'd mentioned, that would make the weights go down. The CG lengths would shorten. It's be 10% to 15% of 18', which would be 1.8' to 2.7' instead of 3' and 4.5'. So the weights would go down to 1000lbs and 1500lbs. That does sound more realistic.

I'll have to think on this a bit. I have always used the length of the trailer for this calculation I'm not sure that you can neglect the tail overhang, because the weight back there is aft of the CG and certainly plays into (de)stability.

Bottom line is load it nose heavy
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Old 07-29-2014, 06:21 PM   #73
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Originally Posted by m.hony View Post
so-
How 'bout weight distribution on that new 23' trailer and Jeep Grand Cherokee?
I don't know if we are necessarily trying to achieve 50/50 weight distribution, but be within factory spec the same amount on the front and rear...
You see, a Yugo could tow a 34' Airstream if he knows something about science- using the levels of gravitivity and polarity-
It came with a Draw tite 600. The hitch bar is too short causing the trailer to ride a bit nose high. Really rides crappy with zero sway control. The trucks and high winds are blowing me all over the road. Hard enough keeping it out of the ditch on these crappy mid west roads. Worse that i have driven on in a long time. Nothing I can do about the hitch until I get home. Easy fix. I will be ordering a new Andersen weight distribution system as soon as I get home.
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Old 08-03-2014, 11:23 AM   #74
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Change of plans. Looks like I will be going to the Blue Ox. The local Airstream dealership has one with the correct bars at a reasonable price. I think it will make a better WD/anti-sway hitch for my combination.
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Old 08-03-2014, 11:31 AM   #75
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Michael, seems like there are more people using the Blue Ox and like it. Please report how it works for your new combo. Congratulations on the new Airstream!
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Old 08-04-2014, 04:19 PM   #76
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Ok, I got the Hensley mounted and tested on a fifteen mile round trip to the scale at the Loves.

There are a lot of testimonials for these Hensley hitches and their ProPride brethren. My conclusion at this point is that the praise is deserved.

It makes the whole feel of my combination feel a lot better all around. Very similar to how a fifth wheel tows, super stable.

I read up on sway control a lot when I first started pulling my trailer, and I had decided to tough it out for a few trips while trying to find a Hensley or ProPride used at a price I could afford, not wanting to buy a lesser product.

I am glad I waited for the deal that felt right to me, and I am glad I didn't settle for less.

I paid $1246 for this lightly used Hensley delivered. After taking a test drive, I would pay full price for a new one if I had to.Click image for larger version

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Old 08-04-2014, 04:24 PM   #77
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I had gotten a weight ticket a year ago no WD,

Steer. 2840
Drive 2840
Trailer 6100
Total. 11860

Today w/ Hensley

Steer. 3120
Drive. 2520
Trailer 6580
Total. 12220

The trailer Isn't exactly the same as it was then, but it should be close enough for comparison.
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Old 08-04-2014, 05:46 PM   #78
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J. Morgan - what a gorgeous trailer!! You now have to pain that Hensley head to match your awesome trailer stripes!

Glad you're happy with it! Safe travels!
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Old 08-04-2014, 05:56 PM   #79
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weight distribution system

Thank you!!!

Really it is a beat up old Sovereign with shinny clothes...

I do like the old girl though.

I think you are right about painting the Hensley. Maybe this winter.
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Old 08-04-2014, 06:14 PM   #80
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Sharp Rig!

I'll echo what SteveSueMac said. I really like your red accents! Sharp looking trailer!

I really would like to get one of those projection hitches. My Equal-I-Zer has done fine the past 7-8 years, but just by design the Hensley and the Propride are better. Good for you man! Many happy miles of sway free towing to you!

See ya on the road,
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Old 08-04-2014, 06:14 PM   #81
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You're most welcome!


While I'm spending your money :-)

You need those red wall radials on your truck and a similar patterned pin stripe.

:-)

Seriously - I love the look of your trailer. Very fun!
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Old 08-04-2014, 08:34 PM   #82
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The red line tires would look boss with some vintage style baby moon hubcaps and some beauty rings.

I have held off on the caps and rings because I was seriously considering going to 16" wheels.....

But so far I have had pretty good luck with with the 15s so I am thinking I might just order the caps and rings.
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Old 08-29-2014, 05:56 PM   #83
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I hate to run salt in a wound I have just gotten back from a 600 mile trip average speed 55-60 mph rain, crosswinds, tractor trailers, stop and go traffic, bumpy roads etc. I did not at any time experience any sway of loss of control. I had a anti sway friction bar in use, no WDS. I spoke with other people in the know and they said it was not needed considering the tow vehicle and the trailer. After this trip I will not waste money. I think the manufacturers have put this fear in a lot of people. Forget the numbers the driving expericence tells all. I guess if you have a heavy camper then perhaps it might be needed, but when the tow vehicle out weights the trailer by about 2,000 lb it is not needed If people find solace in a WDES then they should have them.
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Old 08-29-2014, 06:03 PM   #84
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I never did get sway pulling my trailer on the ball at 60 or below, maybe a little at 65, more pronounced above 65.

My 1/2 ton did not NEED WD, too heavy on the rear or too light on the front never was an issue.

The extra 16" my trailer sits back with my Hensley causes WD to be needed. This leverage changed things.
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