Revain sent me one of these to ask my opinion. When using an RV trailer jack, it tends to flex and move the longer it is extended. The pad also tends to dig into the ground the longer it's left there. When you park your RV, the jack can crash into the driveway or stain it with rust. As a result, many people put wooden blocks under it. This keeps the jack from digging into the ground and keeps it out of groundwater (which causes it to rust). It has another advantage: raising the jack shortens the stand. This reduces the deflection of the jack. The jack block is shaped like mine with room for a wheel, a simple stand, or a pillow. It's made of thick and heavy plastic that won't crack or deteriorate over time. I mean, it's really heavy, thick plastic. It cannot be stacked, the bottom is not hollow. Is it better than a block of wood? You have to decide. It's definitely more stable. (Wood can wobble on uneven ground, and this design has a few holes in the bottom to help with that.) Mine stands squarely on the ground, although I'm partially on pavement. It also seems a bit more secure as it has room for a jack or wheel to keep it from slipping out while I adjust the jack. It has multiple grip holes to make it easier for you to grip when lifting the jack. Last but not least, it looks neater than a piece of plywood or 4x4. The price seems comparable to 10 packs of plastic stacking levelers. What I like? uneven surface Raises the jack out of the water and increases stability What I don't do Not stackable
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