Did any Newells come equipped with air steps?

[CoachCrazy]

I have been searching for a newell and while at an rv dealer who had a used newell I was showed a bus conversion that was equipped with an air step. I thought that was pretty cool and now that I think about it the 2 newells I have seen were equipped with a electric kwikee double step. My question is what year did Newell decide to go with air steps if ever and can an air step be installed on an older newell 80's era ?

Chris