We have found that in composing your fax make sure you list the thing most important to you FIRST. In our experience, (and in conversations with CM's), they try to accomodate your first request, sometimes to the exclusion of all others.
Don't say, "I want a King room on the Kudu trail but only if it can be on the 4th floor, otherwise, I want a 5th floor queen room". With that request, chances are you'll get a King room on the 2nd floor of Zebra trail, and they'll think they've given you what you requested.