Question:
Does a straight-job tanker require a class "A" with Hazmat or class "B" with Hazmat?

Answer:
Class B CDL, then Tank and Hazmat endorsements.

Answer:
Didn't you ask this same question earlier. It requires a class B CDL with hazmat an tank endorsment. My current job is driving a straight truck with a 2400 gallon tank on it.
Coolbreeze

Answer:
Ealier I inquired about a concrete mixer truck

Answer:
Get a Class-A CDL with Tanker, Haz-Mat & Doubles/Triples endorsements...That way you'll be qualified/permited to drv them all.