This Imagine 2150RB is the first RV we've owned with a slide, it has the Schwintek system. The slide is about 8 feet and has the frig and a tri-fold sofa. I've read the manual a number of times, watched some youtube vids and lubed the correct places and the seals. My question and slight concern is when you run the slide out or in it just doesn't sound very smooth. It's a little bit herky-jerky and you can hear the rpms of the motors vary slightly. No evidence of uneven wear on the racks or rubbing marks anywhere etc but I just don't know what is normal. What is it sliding on under the floor and should something down there be lubed? Also my spot at the storage isn't level, should the trailer be level to run the slide? Can't get to the bedroom with the slide in.

thanks
Jeff