No vehicles sit exactly level. Gotta remember, they put the same exact springs on each side with the same exact spring rate. Now rotate one spring 180° and it will sit completely different. Then you also have to remember that a fuel tank only sits on one side of the vehicle. There's nothing on the other side to "balance it off". Plus anything else you could have in your truck that's "off balance". Even so much as tire pressure. Make sure each one is exactly the same, which is impossible. You can have 40lbs of pressure in 2 tires, but one my be 40.1lbs and one 40.9lbs but it'll still only show 40.
So, as stated, really nothing to worry about from the factory.