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My understanding is that USAA pulls EQ nearly 100% of the time, except for mortgages and major loans which will pull all three.
Here is a recent USAA thread in which we discussed many such topics:
http://ficoforums.myfico.com/fico/board/message?board.id=creditcard&message.id=153450
I don't know if they'll look at your balance but whenever you do anything, even the simplest of things, they check to see if all of your other accounts (insurance, checking, and CC) are all in good standing. If one account is late or otherwise not in good standing for whatever reason it will adversely affect the rest of your accounts and your ability to get new services from them, like a new loan.
FWIW, I advise against using them for everything they offer--maybe just one or two services. If you ever have a dispute with them or if something goes wrong, they can and will make your life hell (Yes I know other people swear by them but I am not a big fan).