Keep in mind that teams are switched up. So rather than requesting both a server AND an assistant server, select one or the other. If you request both and they are not a team any longer you may well end up with neither as the person doing assigning won't know which is more important.
(Ditto if you request a rotation AND/OR server AND/OR private/shared table. If you have multiple requests, be sure to prioritize them so the assigner knows which is most important.)