Do you need a " T " endorsement?

You are correct sir.
Or X if one has tanker and haz mat or TX if one has doubles/triples, haz mat, and tankers

 

oh, just study and get all the endorsements you can. when the big bears pull you over and see all the letters they get real impressed and show you more respect!!!!!

 

I don't know for sure, I am sure your state can give you the best information (or the carrier). Worst case, just get the endorsement and have it for whatever. I got mine when I got my CDL for the simple ability to pull a tank if needed. My old man got a "N" endorsement back when CDL's and endorsements came about. He didn't use it until 2009 when he started pulling a tank.