The Quickfit Container Accessories Heavy Duty Caravan & Motorhome 30mm Levelling Slabs are a must-have for caravans and campervans. Made of durable plastic, these stackable slabs have a maximum weight capacity of 45 tons (4 pack) and are suitable for caravan use. With dimensions of 40cm in length and width, and a weight of 5kg each, these grey levelling slabs are designed to provide stability and safety for your travels.