Check the Stromberg Carlson quadra step. I put them on our Sierra. Not sure I remember the rise of each one, but I can measure tomorrow. I liked them better then all the other quad steps. They have a nice radius like the factory steps, they have the anti skid strips on them, and they are rated to 750lbs which makes them stronger then most. Best of all etrailer has them for a great price with free shipping.
Loving our Sierra 365SAQ
Nights camped so far in 2016 = 0
Although Many trips scheduled.