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Old 07-27-2010, 02:56 PM   #11
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This is probably a dumb question but....

How do you weigh the front and rear axles of a truck????
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Old 07-27-2010, 03:19 PM   #12
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A CAT scale should be able to do that in 1 pass.

For the local quarry scale, weigh the truck front axle, total, and rear axle without the trailer hooked up.

Go back to the scales with your trailer hooked up without changing anything in your truck. Now weigh the front axle of the truck by its self (front axle only on the scales) , the total truck with both axles on the scales without the trailer, with everything on the scales, and then just the trailer tires on the scales. The total of everything minus the initial truck weigh-in is the weight of the trailer alone. Subtract the truck alone weigh-in from the 2nd weigh-in from the truck only on the scales, and that will give you the hitch weight.......or take the total trailer calculated weight (total of all 2nd weigh in axles minus the truck) minus the trailer only axle weight.....that should also equal the hitch weight. The front axle weight with the trailer hooked up is easy....you already have that when the front axle only was on the scales. But you need to calculate to get the rear truck weight with the trailer hooked up. Take the total 2nd weights of the truck and subtract the 2nd weigh-in of the truck front axle.....that should be the rear axle weight. You can also take the total of everything 2nd weigh-in, minus the trailer axles and front axle of the truck, and come up with the same figure.

Are you confused yet ?? I think I am.
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Old 07-27-2010, 04:21 PM   #13
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Quote:
Originally Posted by Sparksy27 View Post
This is probably a dumb question but....

How do you weigh the front and rear axles of a truck????
Load the truck with everything you plan on camping with FULL gas; kids; wife; dog; and anything going in the bed including the hitch if you have one. Otherwise add 250 pounds to the rear axle number.

Go to the closest CAT Scale CAT Scale

Pay the 9 dollars.

Drive onto the scale with the front axle on the forward most plate and the rear axle on the second plate.

The operator will give you a print out showing your front axle weight; your rear axle weight and your GVW loaded.

Then you can use the calculator to see where you are. Subtract the GVW that you get from 9200 pounds and that is your maximum safe pin weight.
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Old 07-27-2010, 04:51 PM   #14
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How it all works

Sample work up from my last trip:

FIRST WEIGHT CHECK:

2008 GMC Sierra 2500HD Duramax crew cab SB Full tank with Pull-rite slider; Yamaha 3000SEiB Generator, 10 gallons diesel in cans; 2.5 gallons gasoline; 20 lb propane tank; wife; dog; milk crate wood levelers. ONLY

Steer Axle 4240 pounds ---> max 4500
Drive Axle 3620 pounds ---> max 6084 (based on springs)
GVW 7860 pounds ---> max 9200 pounds

SECOND WEIGHT CHECK with camper

Steer Axle 4360 pounds ---> max 4500
Drive Axle 4960 pounds ---> max 6084
(NOTE: OVERLOADED TRUCK 120 pounds) GVW 9320
Camper Axles 7680 ---> max allowed 8000 based on axles and tires

Calculated pin weight: 9320 - 7860 = 1460 pounds
Calculated Combined weight: 17,000 pounds ---> max 25,000 pounds
Calculated Camper weight: 7680 + pin weight 1460 = 9140 pounds
MAX camper weight 9120 pounds.

Where the pin weight falls:

(1460 pin weight / 9140 camper) * 100 = 15.94%
Safe Range 15% (1371 pounds) to 25% (2285 pounds)
Optimum pin to camper 20% = 1828 pounds
Adding another 400 pounds to my rear axle to get it to 20% would put me over my max gross weight for the truck by 620 pounds.

I could accomplish this by moving stuff currently stored in the dinette (my wine, beer, and soda supplies mostly) and putting them in the bathroom or bedroom. But WTH.

So why are Lou's front tires wearing out faster than the rears.
There ya go.

Easy as pie.

PS if you re-weigh within 24 hours it only costs a buck. So go weight the truck for 9 bucks; go home and hook up; go right back and reweigh for a dollar.
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Old 07-27-2010, 05:02 PM   #15
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Lou, shouldn't your hitch weight be the additional weight on the rear and front truck tires.....1460 lbs.??? That should give you a 16% hitch weight.
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Old 07-27-2010, 05:05 PM   #16
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Originally Posted by mtnguy View Post
Lou, shouldn't your hitch weight be the additional weight on the rear and front truck tires.....1460 lbs. ??? That should give you a 16% hitch weight.
Whoops you are correct. I missed that when typing it up.
It is the Delta of both axles.
Lou
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