I build furniture dollies for my machines. Measure the machine, go to Home Depot and get an eight foot 2x4 or 2, and get 4 of the heavy duty casters with the 3 inch hard rubber wheels. They're between 5 and 6 bucks apiece, but the ease with which they roll is worth it. I use 2 inch drywall screws to fasten the wood into place, and then I drill holes in the corners for the carriage bolts to attach the casters.. I've gotten to the point where I can make one in about 30 minutes or so. It helps that my wife gave me a chop saw for my birthday last year.