My tow rig has single duty. It tows the boats and nothing more. About 2K miles a year. This picture was taken just after purchasing, you can still see the RS sticker in the windshield. It has since been lower 3" in front 4"in rear with a pair of 10" subs behind the seat, a 400 watt Rockford Fosgate under the seat and a total of 10 speakers in the cab. Factory 454, Turbo 400 and 12 bolt.