I have a Range Technology Active Fuel Management AFM Disabler thats only 6 months old that I no longer need as I went with a tuner. Works perfect and in new condition. $100 shipped.
Lets remember, putting spacers or large offset wheels are the same thing. Spacers get a bad name because so many install them wrong or get crazy with the offset. There are many on this forum (too many to count) who use spacers the correct way and never have issues, work truck or not.