Silicone spray on the moving parts works great, don't use any type of grease or WD40, both are dirt/dust magnets.
Used this for years, found at Walmart, never an issue.
Use Pledge furniture polish (I use the dollar store imitation) on slide seals & all rubber gaskets or seals throughout the RV, works great, been using it for the last 6 years & much cheaper than specific seal dressing products. Spray it on a rag & wipe both sides of the seals 2-3 times a year.
Never heard of grease causing resistance, thought it slicked stuff up causing less resistance! Maybe once it's full of dirt!