Just to add to the conversation, I have a stock '96 Dodge 1 ton Dually I bought new and it currently has 26,000 miles on it(yes you read that right, 26,000 original miles). A couple year's ago, I get this severe wobble on the front end thinking its that dreaded "death wobble"....long story short, my driver side spindle was shot. Thank God I found this out before running down the freeway at 70mph and losing the wheel. I played hell trying to get a replacement spindle for it....anyways its not always modifications or harsh use, sometimes it just dumb luck.
Oh, truck has never been used for anything but home improvement projects, I ended up with a motorhome.