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Old 06-09-2020, 08:17 AM   #41
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Single axel t.t behind a midsize/mini truck.
W.D. hitch is a must.
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Old 06-09-2020, 08:36 AM   #42
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Okay. I see some folks saying that a WDH does not change/remove tongue weight. It absolutely does from the engineering perspective of frame and axle loading on the truck.

Doing some calculations very quick and rough using 4th grade level math, you see that if I apply the approximate correction factors I measured with my WDH set up, your truck could have been just fine.

What I saw was that I was able to remove 15% of the gross rear axle load with the WDH compared to without.

That 15% moved to 2 locations, 11% moved to the front axle and 4% moved back to the trailer axle.

Running that scenario, you would have ended up in the Colorado with somewhere around:
2975 lb front axle load, +75 over truck only.
2740 lb rear axle load, +375 over truck only.
3160 trailer axle load, +125 over no WDH.
Around 500 lbs payload applied to truck, 125 lbs payload added back to trailer. Steering axle braking and steering control returned 100%.

So the fun part of the WDH is that without it, based on your scale readings you saw that 2 things came together to screw your rear axle weight. While the truck gained 600 lbs total with the trailer and no WDH, the rear axle saw a 860 lb increase. This came from the 600 lb trailer weight and the 260 lb front axle weight transfer. Both hit that rear axle, very potentially overloading it.

Putting the estimated WDH numbers in means that the rear axle load reduces from +860 LB to +375 LB. This is a HUGE change.
Then you look at the front axle that lost 260 lbs of steering/braking force and see that we were able to fully restore that and maybe add a bit to it.
And the trailer took up some of the work by taking back 125 lbs and still kept that trailer axle load at 3160, well under the 3500 lb rating.

A WDH absolutely manipulates the weights and effectively reduces tongue weight. It does not create or reduce the total weight, but it sure can move it in a very desired fashion so that you can make the vehicle safe and within engineering limits.
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Old 06-09-2020, 11:10 AM   #43
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Quote:
I see some folks saying that a WDH does not change/remove tongue weight.
I think they meant that it does not change LIMIT on tongue weight. On some vehicles, like mid size SUV's, the limit is 500 lbs, regardless if use a WDH. On my Ford F150 without WDH, I think the limit is 500 w/out WDH, and up to 1100 lbs with a WDH.
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Old 06-09-2020, 11:25 AM   #44
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Quote:
Originally Posted by NJKris View Post
I think they meant that it does not change LIMIT on tongue weight. On some vehicles, like mid size SUV's, the limit is 500 lbs, regardless if use a WDH. On my Ford F150 without WDH, I think the limit is 500 w/out WDH, and up to 1100 lbs with a WDH.
Yes, I'll agree with that statement. But tongue weight measured static in the trailer is not the same as measured in the truck with the WDH in play.

The actual tow rating is also greatly effected by adding the WDH. If I recall the manual correctly, on my 2019 F150 it's around 7000-8000 doing a regular bumper pull, or 12,800 doing a bumper pull with WDH that returns the front fender measurements to within 0.25" of empty.

My RAM 2500 is similar, the 14,600 tow is with WDH.

I was pointing out that with WDH, this particular fellow likely would have shifted enough weight around and removed tongue/payload/rear axle weight to the point that he could very possibly have put that truck to the right side of the engineering limits.

I'm not a believer in the 80% rule with regard to towing weight limits because I'm sitting here right now in the technical engineering department.... And I know that every engineering change package we do includes a crap load of conservative calcs. If the book says you can tow xxxx pounds.... Trust me.... Am engineer could sharpen his pencil and move that number easily. That math is assuming the worst in everything and everyone.... Because that's how engineering works. You don't sharpen the pencil and tighten things up until your forced to.
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2019 Ram Bighorn, CC/SB 2500 4x4 6.4L/8 Speed, Max Tow 14,460 lb/2,940 lb payload.
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2019 Quality Trailers 16'x7' 7K GVWR Utility Trailer
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Old 06-09-2020, 01:07 PM   #45
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According to the numbers in your original post:
With TT
Steer Axle: 2680 lbs
Drive Axle: 3220 lbs
Trailer Axle: 3040 lbs

Without TT
Steer Axle: 2940 lbs
Drive Axle: 2360 lbs
Trailer Axle: 00 lbs (no trailer connected)


Yields:
2680+3220-2940-2360=600lbs tongue weight
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