Truck Weights

[salmon7288]

Spent some time weighing all of the trucks this morning. A question about the Peterbilt 579 --

A Peterbilt 579 6x2 weighs 21607lbs, with a 6x2 Mid-lift axle it goes up to 22489lbs, and the 6x4 also weigh 22489.
Compared to the other trucks this is the only truck that has a higher weight for a 6x2 Mid-lift configuration.

Do you think that is a bug, or just the way a Peterbilt 579 is?

Thanks

[Max]

it is most probably oversight, thanks for info.

EDIT: yes, the long versions of 6x2 chassis with midlifts have typo