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Old 03-13-2016, 04:53 PM   #1
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Hitch weight help

Ok had TV weighed at cat scale. Then TV and trailer combination. The difference between empty and combo weight in rear axle (drive axle ) was 1400 lb Hitch weight using a shureline scale is 900lb. We're would the 500 lb difference be?Click image for larger version

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Old 03-13-2016, 06:36 PM   #2
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Your numbers don't make sense. If the Sherline tongue weight scale showed 1400 tongue weight, where did that 900 come from?

A CAT scale will not give you a tongue weight in one pass.

Trailer axles 6780 plus 900 tongue = 7680 gross trailer weight. 900 divided by 7680 = 11.7%. That's a bit less than average, but reasonable.

Trailer axles 6780 plus 1400 tongue weight = 8180 GTW. 1400 divide by 8180 = 17.1 %. That's too high for a properly-loaded tandem axle trailer, so I suspect the 1,400 number is wrong.
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Old 03-13-2016, 07:21 PM   #3
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Smokey,
For clarity, my hitch weight I did at home on a shureline scale like in picture. My cat scale passes were one empty one with trailer. And the 1400 arrived from scale weight at each pass. Click image for larger version

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I did not yet go through the hassle of unhooking unit at scale.
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Old 03-13-2016, 08:23 PM   #4
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I'm curious as to what the front axle of the TV was empty (not towing)
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Old 03-13-2016, 08:31 PM   #5
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3220 empty, 3100 with trailer ( there is 120 that I missed ) going to re weigh empty truck one day this week on way to work. To cross reference......
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Old 03-14-2016, 09:49 AM   #6
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Quote:
Originally Posted by Johnnyb5646 View Post
My cat scale passes were one empty one with trailer. And the 1400 arrived from scale weight at each pass.
Tongue weight = GVW with trailer but with the spring bars of your WD hitch disconnected, minus GVW without trailer but with the shank/head/ball mount of the WD hitch in the receiver. You cannot determine tongue weight based on just rear axle weights, or with the spring bars of the WD hitch tightened, or with the shank/head/ball mount removed from the receiver. GVW = weight on both axles of the tow vehicle.

Hitch weight is a bit higher than tongue weight because of the weight of the WD hitch. So for total hitch weight, proceed as above except remove the head/ball mount from the receiver before you weigh the truck without trailer.

Tongue weight determined by two passes over the scale should give you within 50 pounds of the tongue weight shown by the Sherline tongue weight scale. They probably won't be exactly the same because of rounding of the weights on the CAT scale pads. For example, when fine-tuning my WD hitch, one pass over the CAT scale gave me GCW of 10,400 and a second pass gave me GCW of 10,420. The GCW weights should have been identical, but that 20 pounds difference was because of rounding of the different weights on the 3 pads pf the CAT scale and two passes over the scale.
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