Not sure if this will help or not. I seen a video on utube just this past week and the motorhome manufacturer stated never to use wd40 0n your slides, especially the rubber. WD40 is mainly to displace water, (that's what the WD stands for, water displacement). If you apply that type of lubricanr it will attract dirt and could just gum of the works.
Might be better to contact customer service for their recommendation. Not all service techs are really that good or that informed. (just saying) Just because they wear a shirt that says tech on it doesn't mean they know what they are talking about.
Rick (good luck and enjoy your coach)