Thule Levellers with Carry Bag 2pk***Solid base, which makes it suitable for use on soft ground or sand Maximum load capacity of 5 ton set Three different heights make it easier to get your RV level (44 78 112mm) RV levelling is a common issue lot of people face. On national parks or campsites you will often find parking slots that are not flat for a proper RV camping. Leveling makes your camper more comfortable to stay in and helps features like gas refrigerators function properly.