Do these pads work on gravel or just hard surfaces?

Polyurethane pads grip both—they resist sinking into gravel and lock down on asphalt or concrete. If you're on very soft dirt or sand, place a board under the pad first for extra support.

Can I use just one jack, or do I need both?

Use both. This kit is sized for even load distribution across your RV's frame. Using only one jack puts all 5000 lbs on a single point and risks tipping or frame damage.

Will the pads wear out or need replacement?

Polyurethane holds up well over time, but inspect them seasonally for cracks or flattening. If pads compress permanently or split, you can replace them without buying new jacks.