does DOT require inspections on chemical hoses used to unload tank trucks.
Yes
That the vehicle has passed a DOT safety inspection.
The FHWA inspection is required annually, and it's not limited to just Class 8 trucks.
That happens when the video is loading or "buffering".
A DOT annual is required at least once a year.
That will vary from state to state.
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We have a '78 International that requires DOT inspection (more demanding than regular) the speedometer is 20 mph off and passes every year.
As much as the facility providing the service charges. That's how the price is determined - not by state.
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.
With the brakes applied, the angle of the slack adjuster and the actuating rod should be at 90 degrees.
As much as they charge. It's not set by the state, it's set by the company performing the service.