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MHay's avatar
MHay
Explorer
Aug 25, 2020

Help Deciphering CAT Scale Weights

Hi all,

New to the forum, and to RVing. I want to make sure my WDH is adjusted properly. I took my rig and travel trailer (TT) to the scales this past weekend and did three passes: first was hooked with WDH bars in place, second with WDH bars released, and third was rig and trailer separated. The weights are below. What I'm trying to determine is whether or not I can get more weight off the rear axle and distributed to the front and TT axles. Weights displayed are in pounds.

1st Pass (Connected with WDH bars):
Steer Axle: 3,020
Drive Axle: 4,560
Trailer Axle: 6,560

2nd Pass (Connected without WDH bars):
Steer Axle: 2,740
Drive Axle: 4,960
Trailer Axle: 6,460

3rd Pass (Disconnected trailer from rig):
Steer Axle: 3,200
Drive Axle: 3,560
Trailer Axle: 7,400

From these measurements, I calculate the tongue weight to be 940 pounds (7,700-6,760). Comparing pass 1 with pass 2, using the current setup the WDH bars seem to add 280 pounds to the steer axle, take 400 pounds off the drive axle, and add 100 pounds to the trailer axle. Should I be aiming for more weight on the steer axle (it's 180 pounds lighter than normal drive weight), and less off the drive axle (1,000 pounds more than the normal driving weight). And with only 100 pounds being transferred to the trailer axle, it seems like there's more that could be moved there.
  • routeforty wrote:
    Not an expert at this, but I think we need more info-truck size(1/2 ton 3/4 ton etc) load range of tires on truck and trailer, weight rating of axles and tires on trailer., For me all those weights would mean I'm good to go, but I have a diesel dually.


    It's a 2020 Expedition Max.

    Payload: 1,700
    Front GAWR: 3,450
    Rear GAWR: 4,380
    GCWR: 15,200
    Max Trailer Weight: 9,000

    Notably the rear GAWR is exceeded in the current setup, which is the reason I'm asking if I can expect to be able to move more weight off the rear axle with a WDH.
  • RobWNY wrote:
    I'm confused how you lost 20 pounds completely using WDH bars (14,140 compared to 14,160 for the other two weight rating passes).

    Yeah, I'm not sure about that either. I just chalked it up to an accuracy issue with the scales.
  • Not an expert at this, but I think we need more info-truck size(1/2 ton 3/4 ton etc) load range of tires on truck and trailer, weight rating of axles and tires on trailer., For me all those weights would mean I'm good to go, but I have a diesel dually.
  • I'm confused how you lost 20 pounds completely using WDH bars (14,140 compared to 14,160 for the other two weight rating passes).

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