For anyone that occasionally uses their truck for a little more than it was designed for. Like hauling loads of rock, dirt or drywall as I do 3 or 4 times a year. I just installed the Timbren rear suspension overload rubber springs on my '99 last night with ease. Start to finish it took me only about an hour. They seem to be a well-made product and they include internal frame supports to beef up the frame where the weight will be pushing when the truck is loaded. I have not used them to haul anything yet, but I hope it keeps my mud flaps off the ground when I'm loading the truck down. When the truck is empty, they do not engage so the ride is not hampered for daily driving. FYI