You should also take the test for the Haz/Mat endorsement. You can drive a straight truck with a CDL Class A so if you can apply and have the equipment for the A test,it could come in handy down the road.
many states now require that air brakes are mandatory if application is for a B license. In many states you can have a C license if the straight truck is under 26,000 gvw.
This is soon to change as a new Fed reg is in the works that ALL states will require a air brake test for a class A & B license.
Some of this information is available at www.ooida.com