The Vevor trailer jack block set helps stabilize and level RVs, campers, travel trailers, and motorhomes on uneven terrain. Each block supports up to 6,000 lbs and is made from durable polypropylene T30 for long-lasting outdoor use. The stackable design allows quick height adjustment for convenient setup at campsites. An enlarged footprint improves stability, while the drainage-hole design helps resist moisture-related wear. This 4-piece set is built to provide reliable support across a variety of surfaces.