skate plate
n.— «Husted said the holding cells that will be put in place, perhaps before April, should be manufactured and ready for the county’s use in the construction project by the first of the year. Husted said the cells will be rolled into place on what’s called a skate plate, each two-man cell weighing 5,000 pounds and four-man cells even more.» —“Marshall jail work speeds up” by Anita Munson in Plymouth South Bend Tribune (Indiana) Dec. 12, 2006. (source: Double-Tongued Dictionary)