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Old 02-18-2016, 10:11 AM   #43
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Question Tongue weight or ???

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Originally Posted by JCWDCW View Post
My experience is that you need bars rated higher than the tongue weight ..obviously, but if you go too light then the bars get bent severely and that puts a strain on everything. I would try bars rated about 100 lbs heavier than your tongue weight. The bars should not be flexed too severely when the rig is pulled up level; if they are then they are too light.
JCW
TW.....not so much.

The rating of the bars would be based on the weight being MOVED to get the AS & TV level with the proper amount restored to the FA.
This is where CAT numbers & receiver design come into play.

Bob
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Old 02-18-2016, 10:17 AM   #44
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I agree with Bob.

Continuing....Blue Ox says to match bars to the trailer TW ( contradiction to Hensley AND Reese):

http://www.hitchcity.com/Towing-BlueOx-WD.html
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Old 02-18-2016, 10:19 AM   #45
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Yes, loaded Airstream and loaded truck.

Are there other considerations, such as longer wheelbase truck or Hensley/ProPride hitches which move the w.d. bars farther away from the truck's rear axle? Does truck receiver or frame flex come into play, taking up some of the w.d. bar's force as weight distribution is applied?
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Old 02-18-2016, 10:42 AM   #46
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Doug,

All that comes into play, but would be accounted for when scaling and comparing WD applied and not applied numbers. It could affect bar selection, certainly.

Bottom Line: Manufacturers contradict one another, may not use the same rating system, and use different materials. We are on our own to experiment and potentially buy more than one hitch system or bar rating before we can get it right. It would be nice if the manufacturers reps could talk to this, but IME with talking to several of them, neither they, nor most of the customers they talk to can discuss at this level of technical expertise.

I believe Hensley has it right, but then....why don't they offer a bar and bushing set below 1000#s????? I think I know why, but it flies in the face of their position in the above link.
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Old 02-18-2016, 11:05 AM   #47
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Quote:
Originally Posted by dznf0g View Post
Doug,

All that comes into play, but would be accounted for when scaling and comparing WD applied and not applied numbers. It could affect bar selection, certainly.

Bottom Line: Manufacturers contradict one another, may not use the same rating system, and use different materials. We are on our own to experiment and potentially buy more than one hitch system or bar rating before we can get it right. It would be nice if the manufacturers reps could talk to this, but IME with talking to several of them, neither they, nor most of the customers they talk to can discuss at this level of technical expertise.

I believe Hensley has it right, but then....why don't they offer a bar and bushing set below 1000#s????? I think I know why, but it flies in the face of their position in the above link.

Those Hensley links - it doesn't sound like he's actually talking about a Hensley in his description. If you have 1400# bars and only dial in say 2" of the WD jacks, you're probably only moving a couple hundred pounds to the front axle - maybe you'd need 3" with 1000# bars to do the same. I guess I don't understand what difference the classification of the bar would mean if you only dial in a portion of its total capacity? And wouldn't that be the same on the kinds of hitches where you twist up a certain amount of links?

Maybe I'm missing your point (I can be slow on the uptake sometimes &#128515
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Old 02-18-2016, 11:35 AM   #48
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OK, I had a blinding flash of the obvious!

The spring bars may be changed, leaving the original 'head' alone.

So, at the advice of many (but certainly not all), I ordered the Reese 'SC' hitch with the 1200-pound bars. If that turns out to be too much, it's relatively inexpensive to buy a pair of 800-pound bars... there's nothing in between.

Thanks to all who contributed here!!

Rob
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Old 02-18-2016, 12:19 PM   #49
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Quote:
Originally Posted by RFP View Post
OK, I had a blinding flash of the obvious!

The spring bars may be changed, leaving the original 'head' alone.

So, at the advice of many (but certainly not all), I ordered the Reese 'SC' hitch with the 1200-pound bars. If that turns out to be too much, it's relatively inexpensive to buy a pair of 800-pound bars... there's nothing in between.

Thanks to all who contributed here!!

Rob
Yeah, Reese allows for mix and match of bars. Most, if no all others do not.
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Old 02-18-2016, 12:26 PM   #50
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Quote:
Originally Posted by SteveSueMac View Post
Those Hensley links - it doesn't sound like he's actually talking about a Hensley in his description. If you have 1400# bars and only dial in say 2" of the WD jacks, you're probably only moving a couple hundred pounds to the front axle - maybe you'd need 3" with 1000# bars to do the same. I guess I don't understand what difference the classification of the bar would mean if you only dial in a portion of its total capacity? And wouldn't that be the same on the kinds of hitches where you twist up a certain amount of links?

Maybe I'm missing your point (I can be slow on the uptake sometimes &#128515
The Hensley write up seems to be a theoretical exercise covering the principles of WD, not just their product.

They don't all flex, dynamically, at a given WD "lift". Material and taper come into play.

There's a thread around here (2011?) which goes into this subject in depth. I'll try and find it, but it prompted Andy to do an experiment with a few bars and he has it on his website:

http://www.inlandrv.com/articles/hit...bar-story.html
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Old 02-18-2016, 12:28 PM   #51
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Quote:
Originally Posted by RFP View Post
OK, I had a blinding flash of the obvious!

The spring bars may be changed, leaving the original 'head' alone.

So, at the advice of many (but certainly not all), I ordered the Reese 'SC' hitch with the 1200-pound bars. If that turns out to be too much, it's relatively inexpensive to buy a pair of 800-pound bars... there's nothing in between.

Thanks to all who contributed here!!

Rob
If I were you, I'd start with 600 or 800#ers. I used 600# on my 30 Classic when I ran a Reese DC. Still have it. It is my backup hitch.
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Old 02-18-2016, 12:32 PM   #52
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Here's the test thread:

http://www.airforums.com/forums/f464...hes-72197.html
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Old 02-18-2016, 12:32 PM   #53
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Quote:
Originally Posted by dznf0g View Post
If I were you, I'd start with 600 or 800#ers. I used 600# on my 30 Classic when I ran a Reese DC. Still have it. It is my backup hitch.

NOW
you tell me!
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Old 02-18-2016, 12:34 PM   #54
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Quote:
Originally Posted by RFP View Post

NOW
you tell me!
I did! Up Thread....in so MANY words.

I'd wager from my experience and your brochure TW, that you'll wind up at 850 - 900#s after you're all loaded up with gear. That's right at the same weight I am at with my 30'er. For sure, IMO, 1200# is too much....600# would be my preference, and 800# would be alright probably.
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Old 02-18-2016, 12:38 PM   #55
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Quote:
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I did! Up Thread....in so MANY words.
Sorry, I misplaced my Captain Midnight Decoder Ring
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Old 02-18-2016, 12:41 PM   #56
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CRAP!!!!! I thought I smelled a brain FART!!!!

I had a flash and ran down to the basement to look...it's been 4 years since I looked at my bars....they are 800#ers!!!!!

Substitute 800 for all the 600# comments above.

If I were you, order the 800# bars..

WHEW, panic over.....
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