✔ ANTI-SLIP JOINTING SYSTEM: Carmtek engineers have developed a special jointing system with precise grip channels on the surface of the levelers to prevent levelers from sliding when backing the camper tire onto the levelers. | ✔ HEAVY-DUTY CONSTRUCTION: Built with a high-performance polymer, Carmtek Camper Leveler is made to last a lifetime. Our Camper Levelers works with any trailer that weighs up to 35,000 Lbs and with tires up to 32" diameter. | ✔ FAST & PRECISE LEVELING: Avoid the hassle of setting up your camper with travel trailer leveling blocks or planks under your tires. Make trailer leveling a fast and precise task. Simply level your trailer any increment between 1/2" and 4" in less than 5 minutes. | ✔ LEVELER TRIMMING FOR TIGHT DUAL AXLES: For some dual axle trailers one leveler may need to be cut to length to fit (depending on how much space is between tires), up to 4" can be cut off the leveler with no adverse effects. Typically, the amount of space needed between tires to fit without cutting is about 2.5" to 3" of space, but this varies with tire size. Our package includes clear and detailed instructions regarding the trimming of the levelers. | ✔ LIFETIME WARRANTY: If you experience any issue down the line you are guaranteed a free replacement or complete refund.