I used plywood and roller blade wheels. Really the only mistake I made was putting one wheel on the vertical centerline. It gets in the way of my camera when hollowing. Otherwise cheap and easy. Steve Sinner from the Quad Cities recommends hard wheels. He doesn't want any give in the wheels for vibration. I preload my roller blade wheels, but they still have some give.
I have to disagree about hard wheels. On wood like ash they actually cause vibration because of the hard and soft grain. All the skateboard wheels I've tried left a track around the piece after a minute or so of use and had vibration issues as well as noise. So I tried the LV. The profile is very small at point of contact and the wheels are soft enough to ride out irregularities but still provide support. Noise is at a minimum and so are the track marks. The only negative with the LV wheels is the bigger diameter means you can't use them on small diameter turnings like spindles unless you stagger the wheels or put a sleeve over the turning.
Re: I eliminated the wheel track problem by.......
Dick Hines
By the time you get all the parts ad build a steady rest you can have one shipped from Carter. not cheap but run true and hold your work very securely.