Why not look at Lippert's Solid Steps(~$360) or MORryde's Step Above(~$330). Then there is the TorkLift Glow Step(~$590) which fits in the same place as the original and is also 4 step. I installed the Lippert assembly about a month ago and have to say that it is a perfect addition for my wife and her bad back. There's a thread here of why I did what I did (last 2-3 posts on the thread) :
http://www.keystoneforums.com/forums...t=29952&page=2