before and after
The whole vehicle should have a safety inspection every service.
It would depend on the driver's habits and the vehicle. I would recommend they be inspected by a mechanic every 10K or once a year.
Local mechanics or even places such as AutoZone O'Reilys etc. will inspect and often offer an estimate on fixes or repairs if they are needed for you vehicle.
They are inspected at least once a year. Inspections are random - and without warning.
About maybe twice a year
about twice a year
Very. Dept of weights & measures controls cheating & those that have edibles inspected by Health Dept.
Daily
before use
HME won't be seen on a CDL - the endorsement for hazmat on a CDL is H, or X if it's in conjunction with a tanker endorsement. HME is often used as a shortened form of "hazmat (or 'hazardous materials') endorsement".
For fish tanks, weekly, at a minimum.
Every day