Maggi, assuming that by "pulpit ladders" you mean those used in records centers to reach shelves above chest height, they are more commonly-known as " warehouse ladders".
A DuckDuckGo search using the terms "warehouse ladders on wheels" turned up many vendors, including http://www.ladders.net/warehouse, which seems to have an extensive catalogue.
Good luck,
Fred
Frederic J. Grevin
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