Any law enforcement officer or port-of-entry official with the credentials and authority to do such. Who actually does it varies by state. In Colorado, the scale operators are not inspectors - the inspectors are part of the State Police. In other states, it'll be set up different.
Any commercial vehicle of more than 10,000 lbs. GVW requires an FHWA annual inspection sticker before going on a public roadway. The exception being towed driveaway vehicles enroute to a dealership - the dealership will perform the DOT annual.
Yes
does DOT require inspections on chemical hoses used to unload tank trucks.
That the vehicle has passed a DOT safety inspection.
Yes it offers the staeful inspection.
The FHWA inspection is required annually, and it's not limited to just Class 8 trucks.
?
A variables inspection allows you to see trends and take corrective measures to avoid problems. An attributes inspection is considered ineffective due to the discreet nature of the data and a greater amount of wear on a product to perform the inspection.
A DOT annual is required at least once a year.
That will vary from state to state.
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Ab authorization letter to perform an inspection should include your name and address, the addressee's name and address, a salutation, and an explanation of services needed. Additional contact details should be included as well.