brake dust

Hi, just coming up on 23,000 miles and notice my brakes are squeezing and the dust is mounting. I've done about 2500 miles of towing a 10,000 trailer, but am usually not hard on the brakes. Is this premature wear or what I should expect??

A random poll: I'm just curious what you all do to keep your rims looking clean? Special brake dust repellent spray? Dust covers? Lame or worth it? Wipe 'em down regularly? Clean 'em when you wash your truck? Or anything else that I haven't mentioned...