You should level the system to your liking... I prefer slight nose up and slight right side up...makes water run off the back and also takes into account my heavy slide when out. Once done, follow the directions for the zero point...basically telling the system that is now the position for level.
I will say this, auto level is not always the most efficient. I have pushed the button and walked away, only to find it level with tires off the ground. I can go back and manually do it, and it is level at a much shorter stroke of the actuators.
Cale