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Old 06-04-2016, 10:30 PM   #11
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Quote:
Originally Posted by joehbus View Post
I got the 520 number, how are you coming up with 740?

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Someone may jump in here and correct me. Actual TW should be the difference on the rear axles between no trailer hooked up and trailer hooked up with no bars attached. That would be the same as weighing the tongue by itself. The bars will transfer that weight so it wouldn't be accurate. It may be more accurate for looking at TW% though.

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Old 06-04-2016, 10:52 PM   #12
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Read my post and it explains how to calculate tongue weight.


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Old 06-04-2016, 11:00 PM   #13
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I understand that but, would that be the most accurate way to do so? I'm guessing it would probably be more practical to use the weights with WDH connected as it would factor in to remaining payload and TW% while actually towing. It just wouldn't give you the actual TW as it sits disconnected.
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Old 06-05-2016, 10:46 AM   #14
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Scale help

It is the only accurate way. It is no different than calculating pin weight of a fifth wheel. Get the truck weight. Drop the fifth wheel on and get the truck weight. You need to consider weight added to both axles, not just the rear axle. It is typical for 100-200 lbs to be added to front axle and the rest the rear axle. The sum total of weight added is the pin weight. It is the same with a travel trailer but it works in reverse. Get the truck weight. Drop the trailer on with no WDH hooked up so none of the tongue weight is shifted to the trailer axles. Now the sum total of the axle changes is the tongue weight, but the front axle change is negative. Say the front axle is -200 and the rear axle is +700. 500 lb tongue weight. The 200 lb weight shifted from the front to rear forced by dropping the trailer on the truck is not tongue weight, as it came from the truck and not from the trailer.

The actual tongue weight is what is used in the 10-15 percent. 12-13 is optimal.

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Old 06-05-2016, 11:56 AM   #15
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Makes sense. Now...since, in this example, we couldn't get zero weight transfer to the trailer axles, would I be correct in stating that the trailer axles plus the WDH TW resulted in a 80 lb gain on the total trailer weight? That makes the TW% slightly less...I think about 10.6%. I never really thought about WD affecting balance like that.
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Old 06-05-2016, 12:40 PM   #16
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The WDH will transfer some weight back to the trailer axles, but not being a physics professor I can't answer anything beyond that.


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