I got my class E with the endorsement code to pull a semi trailer do to my fifth wheel, in GA. this endorsement is needed for any truck that has a 5th wheel because it is assumed that if you have a 5th wheel, you are going to use it, does not matter if you do or not, also got the air brake endorsement because that is needed as well, without both endorsements, the DOT, LEO can give you a hard time including giving tickets if he is having a bad day, donut shop is out of his/her special donuts, ect., then it is up to you to fight it in court.
I knew nothing about a DDS-36, never filled one out, the lady behind the counter asked a few questions, one was why a pulling a semi trailer endorsement, told her because my truck has a 5th wheel, other then that a walk through .