Wheelless vehicles are a type of transportation that do not require the use of wheels. A common example is a SLEDGE, which is a vehicle with a flat bottom and two runners, or skis, that allow it to slide over snow or ice. A SLED is similar to a SLEDGE, but it has no runners and is designed to be pulled by animals or people. A dogsled is a type of SLED that is pulled by a team of dogs. All of these vehicles are examples of wheelless transportation.