The white walls were a bit of a trial and error process. I painted a large portion of the center area of the wheels white, and the final solution was to use a rubber washer to cover the white, paint with black around it, and then use a chisel point marker to try and make a good outline around the white.
The fire truck is now work in process. I used my scanner set at 90% and that seemed to work for sizing the plans.
Photos to come when it is finished but with good weather now here it might take a while.