Tanker Drivers - What's the most difficult part of your job?

I just got my hazmat/tanker. Currently just a door swinger. Trying to get into haulin tankers cuz it pays better and home daily would be nice.

I know there are different types of tankers out there, which one do you operate and what are the Pros/Cons of it and your job in general?

Regarding the types of tankers, which one is most "newbie" friendly to operate for someone who is just starting out?