We have a 2016 3024 . We bought it used with 9500 miles a couple weeks ago. The slides are very squeaky. I read that in the Newmar manual that rollers should be cleaned often. How do you get at them and is this necessary? Also how do you get the two zone air conditioner to cool at the same time? We have the filters on the intake opening in the ceiling (none in the ones where the air comes out of. Wish I knew the correct terminology ? Thanks for all you help.