not in v2.28.4 - The Rack Management screen needs the standard options for Documents, Comments, passwords, etc no different than the custom assets. Also you can't search and link a cab from the hudu passwords.
Rack management needs ability for custom fields such like a custom Asset. We have so much to document and track (location, floor, vault, cage, row, number, access method,, door code, 4 post or 2 post, etc..), we have always held this in custom asset.