Where are you camping/parking? Are you boondocking? In 5+ years we have had only 1 campground that was so unlevel that we needed to use blocks to level. We have noticed that the coaches with automatic leveling seem to raise the coach a long ways off the ground. We have manual leveling, lower jacks just until they touch , raise a touch to take weight of suspension to eliminate coach movement and then level from there. If you have automatic, try doing it manually and see if it makes a difference on how far off the ground you are. The tires are always still touching with some weight on them. If you are boondocking, that would explain the need for blocks.