We have had SnapPads on our RV for around 6 months now, they have worked very well in all kinds of conditions from snow and rain to hot and sunny. The manufacturer has come out with another size (10 inches) to fit some other jacks (ours were the 9 inch pads.) We really like not having to climb under the RV to place or retrieve the old boards we used to use for pads, especially when raining or stopping for the night someplace. SnapPads may not be "necessary" and seem expensive, but hey... we spoiled ourselves. I recommend them.