As you could see from the other picture, I originally built the mill using trailer wheels and axles.  I had a tremendous amount of trouble keeping the band tracking while under tension.  I finally figured out the the 2"x2"x1/4" tubing was flexing when I would apply tension.  I purchased new 21" wheels from Lynn Lumber and made an "H" frame.  This took care of all the flexing.  It now tracks perfectly and cuts beautiful lumber!!
Here are some 15 inch Fir boards ready for edging.  New side boards for my truck!