Create a stable foundation for your RV, camper, or trailer with these Heavy-Duty Trailer Jack Blocks . Designed to support up to 6,000 lbs per block , these durable polypropylene blocks help stabilize your RV while reducing jack extension on uneven campsites. Their stackable design allows you to quickly adjust the height for a level setup, while the large footprint helps distribute weight more evenly for increased stability. Whether you're camping on gravel, grass, dirt, or pavement, these blocks provide dependable support for a safer and more comfortable camping experience. Features Set includes 4 heavy-duty trailer jack blocks Supports up to 6,000 lbs per block Stackable design for adjustable height Helps level RVs, campers, and trailers on uneven ground Large footprint improves stability and weight distribution Durable polypropylene construction Resistant to UV exposure, water, oil, tar, dirt, and high temperatures Integrated drainage holes help prevent water buildup Lightweight yet extremely durable Quick setup with no tools required Easy to clean and store Ideal for camping, RV travel, and long-term parking Compatible With Travel Trailers Fifth Wheels Campers Motorhomes Toy Haulers Utility Trailers Trailer Tongue Jacks Stabilizer Jacks Landing Gear Trailer Posts Jack Feet Benefits Helps eliminate trailer movement while parked Reduces tongue jack extension Provides a more stable campsite Helps protect jacks from sinking into soft ground Speeds up campsite setup Suitable for use on gravel, dirt, grass, asphalt, and concrete Product Specifications Model: CXFC02 Quantity: 4 Blocks Maximum Capacity: 6,000 lbs per block Support Height: 8 inches Material: Polypropylene (T30) Block Dimensions: 9.65"" × 9.65"" × 8.03"" Net Weight: 19.18 lbs Package Includes 4 Trailer Jack Blocks Instruction Manual Important Notes Always place blocks on stable ground whenever possible. Verify proper positioning before raising or stabilizing your RV. Inspect blocks before each use and replace if damaged.