The Vevor trailer jack block set is designed to help level and stabilize RVs, campers, travel trailers, and motorhomes on uneven ground. Made from durable polypropylene, these blocks resist UV exposure, water, high temperatures, oil, tar, and soil for long-lasting outdoor use. Their enlarged footprint helps improve stability, while the stackable design allows quick height adjustment during setup. Integrated drainage holes help reduce moisture buildup for dependable performance. This 2-pack is built to support up to 2000 lbs per block for secure RV support.