I drive my 95 Chevy Dually everyday. It has about 100K miles on the bags (200K) on the truck. Been bagged for 6 years now and no problems (see my profile for pics)
My truck is a daily its been bagged since early summer of 2001, only problems i've ever had were like leaks a compressor burned out and a burn realy. Just make sure you have nothing rubbing on the bags.
mine has been bagged for year and half and i run 22" boyds and drive it every day i even drove it all winter in ohio with the stock tires on though didn't wanna ruin the boyds in the snow.