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Old 04-14-2015, 09:44 AM   #31
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Quote:
Originally Posted by Zolin View Post
Tongue Weight (TW) refers to the tongue weight of your trailer and the weight of the cargo that sits behind the rear axle of your vehicle.
Trailer TW is measured using a tongue weight scale
Typically, about 10 to 15 percent of GTW
Etrailer has this wrong. Trailer tongue weight, and trailer weight limits printed on the hitch are the capacity for the receiver hitch itself. Anything in the bed of the truck/ suv goes against payload.

Putting a ton of weight behind the truck axle will surely amplify squat and make the setup on the WDH bars different, but it doesn't take away from hitch capacity.
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Old 04-14-2015, 10:11 AM   #32
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Originally Posted by Crockett View Post
I would think items in the bed would be independant of tongue weight and acceptable as long as gvwr was not exceeded.
I was having some trouble following all the posts

Tongue weight must only be determined with the spring bars removed as it is not changed at all with them in place; only what axles support it. The frame and receiver of the truck and trailer "see" the unsprung tongue weight.

Determine actual camper weight

Sum disconnected truck axles and subtract from connected total rig weight
MUST be less than GVWR of camper

Determine actual tongue weight

Sum unsprung loaded truck axles and subtract sum of disconnected truck axles

Must be less than receiver, hitch, and truck's maximum tongue weight ratings

Weights to compare:

(with spring bars on)
Sum of loaded truck axles less than Pillar Sticker GVWR
Sum of trailer axles less than axle rating x number of axles
Rear truck axle less than GAWR
Front truck axle less than GAWR

Lots more can be determined using your 3 weighings at the scale.
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Old 04-14-2015, 10:20 AM   #33
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Quote:
Originally Posted by ferguson65 View Post
Etrailer has this wrong. Trailer tongue weight, and trailer weight limits printed on the hitch are the capacity for the receiver hitch itself. Anything in the bed of the truck/ suv goes against payload.

Putting a ton of weight behind the truck axle will surely amplify squat and make the setup on the WDH bars different, but it doesn't take away from hitch capacity.
Truck payload is everything in or on the truck (except for a full tank of gas and a 150 pound driver).

While actual tongue load is used to determine hitch load; the distributed tongue load is used when calculating payload. This is because a fraction of the actual tongue load gets shifted to the front and camper axles when the tension is applied to the WD hitch.
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Old 04-14-2015, 10:42 AM   #34
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Quote:
Originally Posted by Zolin View Post
Tongue Weight (for weight distribution) = trailer tongue weight + vehicle cargo load behind rear axle
As always the devil is in the details.

What they are saying is "correct" but not germain to the discussion at hand.

When determining the actual amount of load to be distributed by a WD hitch; it is true that everything "aft" of the rear axle will squat the truck. It has nothing to do with tongue load which is weight added to the truck through the receiver.

Weight added aft of the rear axle is just added to payload carried forward of it.

Where the load carried aft (in the bed) could be a factor is if the maximum deflection of the torsion bars needed to level the load overloads the front truck axle or the camper's axles. In this case moving heavy items up against the tailgate (like gas cans!) forward of the rear axle centerline can require less distribution and relieve some of the load on the distributed axles.
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Old 04-14-2015, 10:47 AM   #35
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Originally Posted by Zolin View Post
as I understand the term "tongue weight" it refers to the maximum amount of weight that can be distributed on the hitch and must include cargo behind the drive axle...
Tongue wt is the weight on the tongue and has nothing to do with what is in the truck bed either in front of the axle or behind the axle. You measure the tongue wt with the trailer unhooked from the tow vehicle.

What the wdh bars have to contend with DOES include what is behind the axle of the truck as well as all the wdh hitch head components.
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Old 04-14-2015, 10:47 AM   #36
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Your weights are darn near perfect from a WDH standpoint. I wouldn't change a thing, certainly NOT increasing pressure on your srpingbars. Your front axle weighs 60 lbs more than unloaded. Can't get much closer than that. The goal is to restore the front axle weight without going over. You are over by 60 lbs but I would call that OK.


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Old 04-14-2015, 10:53 AM   #37
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I always measured wheel well height before and after hitching and adjusted the bars to get the same measurements hitched as before hitching.
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Old 04-14-2015, 10:59 AM   #38
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Great way to measure tongue weight without hooking up:
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Old 04-14-2015, 11:07 AM   #39
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Originally Posted by OldCoot View Post
I always measured wheel well height before and after hitching and adjusted the bars to get the same measurements hitched as before hitching.
OC x2. Measuring is to get the set up right; weighing is where you find out you bought the wrong trailer for your truck, or vice versa.
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Old 04-14-2015, 11:20 AM   #40
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with todays tongue weights, id be concerned about what could be something north of a 300 lbs one dimensional point load on a bathroom scale. how about a 2x2 in place of a pipe, so nothing moves, and a board to distribute load on the scale. this technique was developed before slides when average weights were closer to 400-500 lbs. unless, of course, the bathroom scale has evolved as well to accomodate the increase in weight...NVM
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