Accuracy of CAT scales and are these numbers a sign of load shift?

Product: Packaged frozen food, 625 boxes on 20 pallets. Trailer sealed at pickup at Tyson

Both weighs were full reefer, DEF, and truck fuel

First weigh within 30 miles of getting loaded:
Steer: 12,120
Drives: 30,400
Trailer: 32,540
Gross: 75,060

1000 miles later (600 miles until delivery) after coming to a sudden stop due to a wreck in SLC and feeling a jolt while slowing down:
Steer: 12,140
Drives: 30,660
Trailer: 32,240
Gross: 75,040

Question from me is: Is this a sign of a load shift or a normal variation between scales? If it shifted, I doubt it was drastic or damaged anything, but just curious for future reference.

 

Reckon I’ll find out and update. I know lots of people like to drive through the scales at 20mph to get through the lot quicker, so wasn’t sure how consistent they were. Not really worried about product damage like I would be if it was a beer load or something. I just figured at some point in my career, there might be a situation where reweighing and finding out about load shift early could save some headache at a receiver later on.

This was just the first time in 3 years that I ever came to a truly unexpected stop and felt a jolt. Usually rolling with my CB on and taking it easy through cities

 

Vans/reefers are usually 250-350 pounds shift per hole on the tandems. Depends on make of the trailer and the load, but it’s 8-12inches or so.

I definitely see why flatbedders are always particular about the loading. A lot different when our 1500lb van pallets are off centerline a few inches compared to you all trying to set 20,000+ pounds perfectly center