The DOT number on one of the fronts is

5J23 2613801

The 2613801 is casted in. I believe this means that it was made the 38th week of 2001, 1991 or 1981? Not sure what the 261 is for, but as I understand the date codes read from the last four digits?

Thanks,

Randy Domeck
Indianapolis Fabrications
[email protected]
Indianapolis, In. 46254
317-258-0039