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Old 04-09-2015, 05:23 PM   #1 (permalink)
SpitzoMT
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Scaling Truck & 5th-Wheel

Hello all. I think I have myself confused here, so I need some input. Truck & 5th-Wheel are in sig. Ok.....I'm going to hit the Cat Scales next week. I've never done this before & not sure of the proper way to go about it. Over thinking it & got myself all confused - LOL. I'll be fully loaded up as if I were heading out for the weekend. Should I pull on with my whole setup, then pull off drop the 5th-Wheel & pull the truck back on ?? Will this work for me or does it even matter ?? Really curious as to what the pin/hitch weight is on this trailer.

Oh.....I just got off the phone with B&W & they said 175 lbs. for the hitch. Will this figure into the equation ??

Thanks in advance for replies, I know you all will set me straight !!

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Old 04-09-2015, 06:45 PM   #2 (permalink)
Tom S.
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It's best if you can play around at the scale. The best possible info you can get would be for the weight at each wheel of both truck and trailer when hooked up, plus the weight of each wheel on the truck when not hooked up. You don't need the weight of each trailer wheel when unhooked as it will be the same as when hooked up. When hooked to the truck, the truck takes some of the trailer weight at the pin and when unhooked, the front landing gear take that weight, so the weight on the tires remains the same, at least for sake of this discussion.

Unfortunately, you can't get individual wheel weights at a CAT scale. The best you'll be able to get will be axle weights - kind of. I would go about it this way: Drop the trailer and put the truck on the scale so just the front axle is being weighed. Record that weight as "A". Then pull the whole truck on the scale and record that weight as "B". To get the truck's rear axle weight, subtract "A" from "B". Now, with the trailer attached, pull just the front axle of the truck on the scale and record the weight as cited above. Then the whole truck and record that weight. Again, to find out the weight on the truck's rear axle, subtract the front from the total weight. Then pull the trailer on the scale so only it is on the scale and record that weight. Then pull the trailer forward enough for the front axle to be off the scale and record that weight (I'm assuming it's a tandem axle and not a tri-axle trailer). That will give the weight on the rear trailer axle, and subtracting that weight from the total trailer weight, will give you the weight on the front trailer axle. Subtracting the truck's rear axle unloaded weight from the loaded rear axle weight will tell you how much the trailer pin weight is. Adding the pin weight to the trailer weight will give you actual total trailer weight.

So, why do you need to know all this crap? It will tell you if you are within the load ratings for both truck and trailer and give a good indication if the load on the tires is within specs. Note that this is not as good as if you could have weighed each wheel separately, since weights on individual trailer tires are almost never equal. If you could jockey the trailer around so you could each wheel on a corner of the scale and get it weighed, it would be great, but I doubt that will happen, and I'm not sure how accurate the scale would be. There are people who travel to trailer rallies to perform this function with individual scales. It can be an eye opener. On paper, my trailer has more tire capacity than needed, but in reality, one of my tires is actually over the limit by a few pounds.

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Old 04-09-2015, 06:54 PM   #3 (permalink)
Ron Nielson
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You might take a look here: How To Weigh | CAT Scale

Makes it pretty simple/understandable, doesn't it?
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Old 04-09-2015, 11:39 PM   #4 (permalink)
SpitzoMT
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Thanks Tom. My 5th-wheel toyhauler is a triple axle.
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Old 04-09-2015, 11:57 PM   #5 (permalink)
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Quote:
Originally Posted by Ron Nielson View Post
You might take a look here: How To Weigh | CAT Scale

Makes it pretty simple/understandable, doesn't it?
Thanks for the reply Ron !! That truck & 5th-wheel chart is how it's done. I actually called the place after I posted on here & that is exactly how the guy explained it to me. Sounds simple enough. He said it's gonna cost me a whole $12.50. I can handle that.

Pull on scales.
Truck front axle on pad A.
Truck rear axle on pad B.
5th-wheel triple axles on pad C.
Pull off scales & unhook trailer.
Pull back on scales truck only.
Truck front axle on pad A.
Truck rear axle on pad B.
Done.....!!
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LMM Duramax - Flo~Pro 4" DownPipe Back w/Muffler, EFILive w/DSP5, Edge Insight CS w/Pyro, EGR Blocked
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Old 04-10-2015, 01:39 AM   #6 (permalink)
Gunrok 02 LB7
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That's how I do it. Those cat scales have different pads for a reason. Subtract unloaded rear axle weight from loaded rear axle weight, unloaded front axle weight from loaded front axle weight, add those two together to get pin weight. Add pin weight to trailer axle weight to get total trailer weight. Those CAT scales make it so easy. Just FYI, and you may know this already, the CAT scales list front axle as steer axle and rear axle as drive axle.
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Old 04-10-2015, 03:38 AM   #7 (permalink)
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Quote:
Originally Posted by Gunrok 02 LB7 View Post
That's how I do it. Those cat scales have different pads for a reason. Subtract unloaded rear axle weight from loaded rear axle weight, unloaded front axle weight from loaded front axle weight, add those two together to get pin weight. Add pin weight to trailer axle weight to get total trailer weight. Those CAT scales make it so easy.
Wow.....Excellent info Gunrok. The reason for my trip to the scales is to find out the pin weight & total trailer weight. Thanks a bunch, appreciate your input !!

Quote:
Originally Posted by Gunrok 02 LB7 View Post
Just FYI, and you may know this already, the CAT scales list front axle as steer axle and rear axle as drive axle.
Yes, I noticed this on their website. Front axle/rear axle is just so much easier for my simple mind - LOL.
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LMM Duramax - Flo~Pro 4" DownPipe Back w/Muffler, EFILive w/DSP5, Edge Insight CS w/Pyro, EGR Blocked
6-spd Allison - Transgo Jr/Mag-Hytec Deep Sump Pan/TranSynd Fluid
2010 GMC Sierra 1500 CC/SB/6.2L/Pure Silver Metallic (Wife's)
2014 Heartland Cyclone 4114 5th-Wheel ToyHauler - B&W Gooseneck w/Companion
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Old 04-10-2015, 06:01 AM   #8 (permalink)
Tom S.
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Quote:
Originally Posted by Ron Nielson View Post
You might take a look here: How To Weigh | CAT Scale

Makes it pretty simple/understandable, doesn't it?
Very cool! I didn't know they had three separate pads. My experience is with the junk yard scale up the street - one scale pad only.
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Old 04-14-2015, 08:39 AM   #9 (permalink)
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I hate to bust your bubble, but I can tell you right now that you will be overloaded with that truck and trailer combination. Let me know what the numbers say, but my guess would be the GVW of the truck(loaded) will be between 11,500 and 12,500# and the RAW of the truck(loaded) will be over 7000# Both numbers are over the manufacturers specs.
Frank
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Old 04-14-2015, 11:05 AM   #10 (permalink)
ktmrfs
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In oregon, the DOT scales run even when the weigh station is closed. And use is encouraged. So... I just drive out to a local closed weigh station and take my time weighing. I move out of the way if a trucker comes rolling in to go over the scales. Don't know how other states handle closed weigh stations.

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