Some types of scissor lifts, such as our rough-terrain scissor lifts, can handle sloped surfaces up to a certain degree thanks to their self-leveling platforms and overall rugged design. However, the degree to which a lift can function on a slope depends on the unit's gradeability, which will vary from product to product. We recommend consulting the owner's manual and speaking to a United Rentals representative for detailed information on your scissor lift’s specific gradeability.