The OX BLOX Trailer & RV Jack Stand Block is a strong, stable, and versatile trailer, camper, and RV support block that works with virtually any scissor jack, tongue jack, post, foot, or round and square stabilizers. This camper stabilizer is professionally engineered to be stable and durable is made in the USA from recycled plastic and is UV and temperature resistant. They work well on virtually any surface including gravel, grass, dirt, and pavement. These leveling blocks for travel trailer will hold stable in a variety of circumstances. The unique design allows for a variety of supports: it can support the post directly, it can support rectangular, square, and round feet, it can support the wheel jack, and more. These leveling blocks for RVs are also stackable and can be used to support the frame, making it easy to work with your truck and trailer. This RV tongue jack block is made in the USA from 100% recycled plastic. They are sturdy and stable enough to work on their own, without the need for trailer and RV jack pads. The holes on each side make them easy to grab, carry, and move around. Take the OX BLOX camper accessories for travel trailers on your next camper trip and rest easy knowing your trailer is stable and secure.