well it is hard to say since you have not looked at it for sure, but it could be just settleing into the ground because the left side of the coach most likely is where your slidout and stuff are so you may be a little heavier on that side the other thing it could be is you might have a little bit of air in the system and over time with using it, it should work itself out. but if it doesn't i would just watch it for awhile and if it continues to do it give us a call so that we can find you a service center to go to.
Thanks Jason