Although inflatables are large and heavy, they cover a large surface area and will have a minimal impact on your grass. It will flatten grass temporarily, but we've never heard of any permanent damage. We will put stakes into the grass to hold the inflatable in place, but these holes are no larger than what you typically see with lawn aeration.
Once or twice a year, we do accidentally hit sprinkler lines with our stakes. If this occurs, call us and we will repair the line at no cost to you. We do not reimburse repairs done by the renter or a 3rd party contractor.