SPYDERLK, thank you.  As I had mentioned, I was trying to figure out how to pull or push the wheels in or out.  I was thinking of using spreader bars or clamps, but I couldn't find any that would work effectively.  Your mention of using a come-along got me thinking about how I would attach it, and I used a set of fence stretchers.  I didn't need the come-along given the leverage they provided.  You were right about moving it incrementally.  Once I got the tie-rod in, I could twist that by hand a little at a time as well.  Thanks again!