We have had a problem with one of slides since we bought our 2015 coachmen sports coach 404RB last year. The large driver side front slide has about a 1 inch gap at the bottom when fully retracted. I have tried several suggested adjustments and can not get it corrected. The slide is a Lippert rack and pinion flush floor slide with center drive motor. It does not have any can adjustments for in and out. Any help would be greatly appreciated.