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Old 02-18-2016, 12:50 PM   #57
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<<< snip >>>

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

WHEW, panic over.....
Well, probably so. The hitch with the 1200-pound bard is on its way from the warehouse near Dallas... I'll have it tomorrow. Worst case is that I buy a pair of 800-ers and that's that.

Please forgive my inability to figure this stuff out; I'm new to anything larger than a 17' Casita. I realize that 'recommendation' can be found in 'experience stories' ... I'm just not smart enough yet to be able to do that. I do appreciate your input!

Rob
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Old 02-18-2016, 01:18 PM   #58
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Change the order while you can. 1200 lb. bar will tare your trailer up.
if the truck is too lightly sprung you can change the spring pack or add a helper spring.
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Old 02-18-2016, 01:48 PM   #59
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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 ��)
Steve, I've wondered the same. I think the difference is in flexibility of the bars so we and our Airstream do get a decent ride, but maybe more importantly we don't over stress our A-frames and receivers at driveway entrances such as the sharp angle imposed by some gas stations.

That said, ProPride recommended 1400# bars for our FC 25 and Ram 1500 full coil spring, 120" wheelbase. Great ride, no porpoising, nothing breaks or gets tossed around in the Airstream. Using Inland Andy's technique of jumping on the hitch connection, there is a couple of inches of movement which he likes to see. Although some of that flexibility is in the truck's coil springs and and Airstream's torsion bar axles.

There's more to this than simple bar rating (surprise, surprise). As Steve said we need to experiment with our own particular rig to get the desired results. This is our third w.d. hitch in eight years.
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Old 02-18-2016, 02:14 PM   #60
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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

Thanks. Read the entire thread....

1) my head hurts as much now as yours did in 2011

2) quite a bit of drama there before getting to the punchline

3). The punchline still leaves me wondering but I'm no engineer either and think I'm probably asking the wrong question.

I know that I went with 1000# bars on my ProPride because of the countless threads from Andy that warned of ruining the trailer with too much stiffness in the bars (especially with a 2500 truck). Upgrading to the 1400# bars hasn't hurt the trailer at all. I can't tell if it's that or the proper reinstallation of the hitch by Colonial that improved the ability to distribute weight and reduce porpoising. But no damage or popped rivets.
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Old 02-18-2016, 03:51 PM   #61
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Imagine replacing the rear springs in a 1/2 ton truck, which support the rear of the TV fine and at an appropriate height, with a spring pack off a 1 ton dually. It still supports the same weight at the same height (theoretical assumption).

Now drive down the road. Which one flexes and smooths out the bumps better?

WD bars are SPRINGS. They are supposed to support weight. They do it by supporting that weight in different vectors than a rear leaf spring, but they are in essence the same thing.

Now, given a certain TW and load, which smooths out the undulations and dips and peaks in the road...the 800# spring bar or the 1400# spring bar?
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Old 02-18-2016, 04:55 PM   #62
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I'm tempted to say the 1400# springs because it would take more force to compress them - and yet, I'm preparing for that to be the wrong answer 😃
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Old 02-18-2016, 05:03 PM   #63
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Guess it depends if you prefer a Cadillac ride or a Corvette set to track mode ride for you and your AS/tv
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Old 02-18-2016, 05:23 PM   #64
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Is it wrong to imagine the WD jacks on a HAHA/PP change the dynamics of the spring that is the WD bars?
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Old 02-18-2016, 05:29 PM   #65
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Guess it depends if you prefer a Cadillac ride or a Corvette set to track mode ride for you and your AS/tv
Can't remember when I was in a Cadillac last... but my Corvette (Z51) would beat you to death. However, the 'Vette seems downright comfy compared to this beauty...

he he... hijacked my own thread!

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Old 02-18-2016, 05:29 PM   #66
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No, but that only changes the "load" on the spring not the flexibility of the spring. Refer to the graph in Inland Andy's graph and compare the curve of the EQ 1000# bar and the Reese 1000# bar. They flex differently with a given load.
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Old 02-18-2016, 05:37 PM   #67
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Aha! So you've got spring A which is able to handle 800# and spring B which is able to handle 1400# - the argument is that if you put the same amount of load on them (say 500#) spring A would react to that old more smoothly than spring B (as spring B is presumably "stiffer") - is that the thinking?
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Old 02-18-2016, 05:42 PM   #68
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Yes , if I understand you correctly. The drawback is more amplitude of porpoising on those sections of road prone to create it. BUT, just like I didn't buy a 2500 Duramax solely for the 5% of miles I'll drive in the mountains, I don't hitch for the 1% of roads that'll cause porpoising.
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Old 02-18-2016, 06:08 PM   #69
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Can't remember when I was in a Cadillac last... but my Corvette (Z51) would beat you to death. However, the 'Vette seems downright comfy compared to this beauty...

he he... hijacked my own thread!

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Depends on the Caddy
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Old 02-18-2016, 06:14 PM   #70
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Depends on the Caddy
True, I thought of the V series after I posted, but I think you get my drift.
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