Just got back from a 1600+ mile road trip with the 99 Suburban and she did great (for the most part). However, on the way back there was a lot of rattling noise coming from the front of the car which progressively got worse. The noise sounded like a bad shock, and sure enough the front left shock had oil all over it. It is a Monroe Reflex monotube that I installed in February. What would cause this to go bad? I read on Monroe's web site that a missing suspension stop could be the issue, but that's not the case on mine (though I'll double check). This is the second set of Reflex shocks I've put on the front (the first ones lasted about 15 months). The reviews I've read is that they are good shocks, but I don't want to have to replace them again. Any ideas? Also, suggestions on what I should switch to? I'm thinking Bilsteins.