It seems like everyone here is running some sort of spacer. Has anyone ever had any problems with them? I talked to the people at America's Tires and Les Schwab and they both said they wouldn't touch my Commander with spacers on, due to liability reasons... So I am wondering if they are even worth the hassle or if anyone has ever experienced any problems with them? How often do you guys check your spacers? Has anyone ever had one come off?