I assume you are talking about a new 2018 model. This is not uncommon as you drive it and it settles in from it's as built condition. Dealer should be able to adjust under warranty.
If not, it's no different than adjusting a door in a house.
Or when you level it you are twisting the frame. You're leveling via blocks under the tires and the front jack, right? You're not using the stabilizers to level, are you?
2013 Silverado 2500HD Duramax/Allison
2018 Jayco White Hawk 31BH