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Old 04-09-2015, 06:18 PM   #11
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Not sure why you even need air bags for 1/2" of front end rise. Another washer or link on the chain would do it. Under your theory then why even use a WD. Why not just hook up without WD and air it up till the front drops to where it needs too. I bet you can't.


What you're doing is in small terms. No way can you load 8-900lbs on the rear of a truck and raise the rear and drop the front back to normal. You certainly aren't transferring any weight to the TT like that.


Under your theory WD is not needed. Just more air. I find it hard to believe that all thru the years of towing when both WD and bags are available that no one has ever said take your pick. Or you can achieve the same results with both.


Also if you are using a WD with built in friction bars then you are lessening the friction when airing up the bags.
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Old 04-09-2015, 06:22 PM   #12
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Not sure why you even need air bags for 1/2" of front end rise. Another washer or link on the chain would do it. Under your theory then why even use a WD. Why not just hook up without WD and air it up till the front drops to where it needs too. I bet you can't.


What you're doing is in small terms. No way can you load 8-900lbs on the rear of a truck and raise the rear and drop the front back to normal. You certainly aren't transferring any weight to the TT like that.


Under your theory WD is not needed. Just more air. I find it hard to believe that all thru the years of towing when both WD and bags are available that no one has ever said take your pick. Or you can achieve the same results with both.


Also if you are using a WD with built in friction bars then you are lessening the friction when airing up the bags.
You don't seem to grasp the fact that I do not mention unhooking or not using a wdh. In my question, where does the 200# go?
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Old 04-09-2015, 07:39 PM   #13
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You don't seem to grasp the fact that I do not mention unhooking or not using a wdh. In my question, where does the 200# go?

Some people just don't get it.. Try to help someone who doesn't get it and they question you?
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Old 04-10-2015, 08:49 AM   #14
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I will pose this question to you both. WITH the wdh hooked up and assume that raised the front of the truck 1/2" from normal and it took 200 # off the front and by adding air to the bags, you got the front back down the 1/2", where would the 200# go?
The front fender measurement would not come down by just adding air to airbags.....they do little to redistribute the tongue weight. The front bumper would come down because of the overhang, but not the front fender.

With the WDH hooked up, raising the rear of the truck with air bags would actually take more weight off of the front axle, since you are relieving some of the tension on the spring bars.

Think of it this way: I think we all agree that tilting the head assembly back more increases more weight to the front axle of the TV. By adding air to the air bags, you are now tilting the WDH head assembly further forward (as the back end of the truck rises).
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Old 04-10-2015, 12:16 PM   #15
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i have the husky w/d with the bars 2013 ram 1500 5.7 with 3:92 gears and air lift bags camper is 35 ft long 7400 lbs and i can't ask for better. just wish it had better m.p.g. when towing
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Old 04-10-2015, 12:33 PM   #16
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...The front bumper would come down because of the overhang, but not the front fender...
Defies logic!
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Old 04-10-2015, 01:01 PM   #17
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At times I am amazed! Towing is basically a statics/physics question (torques and moments) it really isn't that difficult.

In a true statics scenario air bags will not truly "distribute" tongue weight to the front, air bags counter act the downward force of the tongue weight. For instance, the true weight of the front does not change, the thing that changes is how that weight behaves. By adding a weight to the back of the CG it lifts the front up, the weight of the front remians constant but now we have the rear CG weight counter-acting how that weight is behaves from a scaled sense. So by adding airbags and lifting that rear CG weight away from the ground it forces the front end back down to where the weight is back in the normal ride position.


If mtnguy is talking from a physics standpoint only, and each piece individually (the trailer, the wdh and the truck) I am inclined to agree but the problem with this type of thinking is all 3 of these cannot be analyzed individually, from a statics standpoint it has to be the summation of all three.

When you are talking about all 3 in summation then OC is the closest explanation and his thoughts are what is in line with industry standard. A WDH helps transfer trailer weight evenly across a TV, when a WDH is not enough to 'level" a vehicle and trailer then airbags are used to raise up the TV and a drop shank is used to lower the attach point to a TV in order to level..

I think what happened in this thread is mtnguy was speaking from a statics/physics standpoint and OC was speaking from a real world all three in summation behavior standpoint. If this is what was happening then both are right in their own way.
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Old 04-10-2015, 01:19 PM   #18
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... the true weight of the front does not change, the thing that changes is how that weight behaves. By adding a weight to the back of the CG it lifts the front up, the weight of the front remians constant ...
Agree the actual weight of the front end does not change, but the weight on the tires/suspension does change from adding wt to the rear end, you can see it from watching the bulge in the tires change.
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Old 04-10-2015, 01:29 PM   #19
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Agree the actual weight of the front end does not change, but the weight on the tires/suspension does change from adding wt to the rear end, you can see it from watching the bulge in the tires change.
Yes this is what I was trying to illustrate. By adding a WDH, the WDH tries to distribute the TW evenly across the TV, this is accomplished by adding torsion between a double moment arm.

I think what mtnguy was doing was talking about the statics of each individual piece then trying to relate how that isolated piece affected the other 2 without taking into account the counteraction of the other pieces.

Airbags cannot create the same torsion arm that a WDH can.

In my opinion I would go WDH first, then if the ride you want cannot be achieved with a WDH alone, then I would go bags or helper springs in addition to the WDH. This will allow for weight distribution (correctly) to the front axle and then allow you to level (front to back) the entire rig.
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Old 04-10-2015, 01:30 PM   #20
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Easy to prove or disprove. If someone that contends it does distribute weight forward. Take the rig to a scale. Take a picture or get the weight ticket to show weights, then add air to the bags and get another ticket with the new numbers. I would be interested in the results just for curiosity as I do not have a tt.


The front bumper will lower because that is in front of the pivot point being the front axle. The fender measurement, if taken at the point of the axle should not change.
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