Interesting.
maybe Weight is good or has errors... total is w/in the ballpark.
Why? Most scales have problems accurately reading the load at edge of platform.
If you can, Try doing one axle at a time that centers the load on 2 scales and see if weight changes.
(total weight is just sum of scales.)
You can try contact scale maker...
Avery Weigh-Tronix (Avery/ITW is current owners of Weigh-Tronix)
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)