Relay weights different on my truck?

NO! Fuel is not going to make an almost 700-pound difference in those trailer tandems. Some I will agree, but not 700 pounds. Also, that 5th wheel slide adjusts the weight on the tractor, not the trailer tandems.

Gross weight yes, fuel will change it.
Tractor tandems yes fuel and 5th wheel will change it.
Trailer tandems NO either load shifted or the weighing was not done right.

 

One of the most frustrating things I can remember about my driving career was getting a repower with the tandems slid all the way up and still overweight on my drives. Can't fix it. My 5th wheels always had the slides disabled. I remember once getting a load out in Colorado that was almost 4 thousand pounds over on the drives and the tandems were all the way forward. Took almost 2 days to get that load opened and into a dock where they could put several bulkheads on.

 

Regardless of the tractor, any unit that trailer is hooked to will have the same trailer tandem weight as long as the tandem position has not changed. There are two points of measurement, the tandems and the kingpin. The weight on either one will not change due to a power unit swap. How the weight of the kingpin is distributed between the steers and tractor tandems can vary between units, but not the trailer tandems.

 

Absolutely, that trailer as a separate unit weight WILL NOT change. The weight on the tandem and kingpin will be the same no matter what the trailer is hooked up to. The only thing that will change the weights is reefer fuel or a load shift. That's IT! The 5th wheel will determine how that weight along with the tractor tare weight is distributed between the steers and drives.

In the case of the OP I am not sure you can move 600 pounds off the drives to the steers.

Unfortunately, there are times a driver can't fix a load.

 

I once switched trucks with my partner and his wife. we cleaned out his truck and made a smooth ton difference in the weight of the tractor. Just because two trucks are the same model does not mean they will weigh exactly the same.

 

The first words of my post were "There are THREE things at play".

The first reason is the load shifted. This represents the lions share of the difference.

However the truck DOES make a difference. Take the same make and year.

• One truck has 100 gallons of fuel, one has 200 - which one is heavier and by how much?
• If they have similar fuel levels but one has its 5th wheel all the way forward, one to the back. Is the weight distribution the same?
• One has a full set of tire chains, one does not. Do they way the same?

My p4 cascadia with an say weighs more than p4s without. The p4 cascadia weighs more than the p3. A cascades weighs more than a century by 800 pounds. Does a kw t680 weigh more or less than a cascadia? Does an amt weigh more than a manual transmission?

Just because they drive for the same company does not mean they drive tractors with similar weights. That was my second point and third points.

He has a gross weight difference AND a distribution difference. It is a combination of factors.

 

The truck DOES NOT have anything to do with the weights on the trailer tandems, NOTHING! Yes, things like chains will. The only thing fuel and truck do are effect the weights from the kingpin. Outside of a load shift, this weight WILL NOT change no matter what kind of truck is under the trailer. This is simple physics. The OP has drives that were over by 600 pounds. Yes, fuel will change that weight. My point was the trailer tandems had a change. This can only be caused by 1 load shift, 2 driver moved tandem after taking weight or misweighed, 3 picking up driver make some kind of mistake weighing. Fuel can have nothing to do with this weight.

 

So why did you quote my post and say no when the very first thing I mentioned was load shift before going on to mention other factors that have changed?

You know what could also be at play? Truck 1 scales eith the drives at the very back of the platform, truck 2 scales further forward. I have had 100 pound gross weight changes between reweighs.

There is porentially more at play than a load shift.

 

one scale is always gonna be different than the other. i have scaled the same load multiple times at truck stops and every one of them says different and i dont just mean different weight because of fuel.. i have seen different weights on trailer axles , which would make no sense if freight hasnt moved.... then i cross the scale at the coops and every single time its a different weight...last load i had 21k on my back axle . 19k on the front of the spread axle. 20k on axle is max on a 10ft spread. 26k on drives and 11.5 on steers.. i said #### it i didnt want to go get it reworked, since i picked it up from cmc steel and they are a pain to deal with sometimes... i ran it thru a couple scale houses waiting to see the red light ...but it didnt happen ..nobody messed with me...i was under gross tho maybe thats why.... that was thru utah , idk how much of pricks they are out east.. good luck to you driver.

 

I quoted you because you are really stretching things a bit here. Now you did it again by going on about tandem positions changing. It would (or should be) safely assumed no tandem sliding happened after the final weight by the first driver. If that driver did move those tandems after getting a good weight ticket that driver is an idiot.

Those 2 weigh tickets show a movement of 720 pounds on the trailer tandems. Then almost a 1000 change on the drives. The steers have not changed that much.

The OP said the tandems are full forward. Truck and fuel won't account for that trailer tandem difference. It boils down to a failure to properly weigh or a load shifted.

If I were a betting man I would wager the OPs truck is a bit heavier, that accounts for the weight difference on the drives. However, it does not account for the trailer. I have seen pallets (walk) before. Some shippers don't load correctly. More times then I can count I have had this issue.

Have a great day!