10,000 lbs. GVWR and up in a commercial use vehicle, and the answer is yes.
The air brakes are irrelevant. And you'd need a medical card in that instance if you were doing interstate operations, but not intrastate operations.
No.
Find a company which is hiring and will provide OTJ training. It'll require some leg work on your part, but they are out there.
If the commercial vehicle requires a CDL to drive it, you do.
Any commercial use vehicle or combination with a Gross Vehicle Weight Rating or Gross Combination Weight Rating in excess of 10,000 lbs. requires a DOT medical card for interstate operations. Intrastate operations tends to be a little bit of a grey area, although some state laws clearly require it. If the Gross Combination Weight Rating (combined GVWRs of both power unit and trailer) exceeds 26,000 lbs., and this is a commercial use vehicle, then it will require a CDL (Class A if the trailer has a GVWR in excess of 10,000 lbs., Class B if the trailer has a GVWR of 10,000 lbs. or less), and thus a medical card will be required.
Yes anytime your driving a vehicle that requires a health card you need to have your health card with you
For Class 7 and Class 8 trucks which are registered farm use vehicles, most states require the operator have a current DOT medical card.
If the Gross Vehicle Weight Rating - not the actual laden weight at the time - is under 26,000 lbs., then no. You will, however, need a current and valid DOT medical card.
If the GVW is more than 10,000 lbs, yes.
If the vehicle doesn't require a CDL and the vehicle is registered in that state, no. If the vehicle requires a CDL, yes. Vehicles falling under exemptions such as the farm truck exemption or emergency vehicle exemption vary by state.
If it is being operated across state lines, yes - any CMV with a GVWR in excess of 10,000 lbs. requires a DOT medical card for interstate usage. An F350 has a GVW ~13,000 lbs.If it is transporting a quantity of hazardous materials which requires placards to be displayed, it requires a Class C (minumum) CDL and hazmat endorsement, and a DOT medical card is requires.If it is towing a trailer with a GVW in excess of 10,000 lbs., and the Gross Combined Weight Rating of truck and trailer is in excess of 26,000 lbs, then a Class A CDL is required, as is a DOT medical card.If it is a bus designed to transport more than 15 persons, then a Class C CDL (minimum) is required, with a passenger endorsement, and a DOT medical card is also required.
If you can't meet the requirements to obtain a DOT medical card, then no.