I was looking at the step rails, but on my wife's prevous pathfinder, they rusted out in 8 years. So we discussed the stirups, but she did not like the look of them.
I did find a set of power steps (cannot find the link right now but will post l8er) that lower when you open the door. They were $220 per step. They come down 6,8 or 12 inches depending on what you select.
I have never been able to find a place to buy the other one, or even a price. The Sidewinder is one of the other two I have seen. There are qute a few on the market. Have to see who makes one that will fit the titan with minimal modification!