Every owners manual I have read specifically says to NOT use any supports under the slides. The problem is if the RV settles one one side, it can cause the slide to be in a bind and cause mechanical damage as well as leaks.
The reason stores sell them is that some folks never read the owners manual.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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