I have decided that the best way to move my nearly 600-pound jointer/planer from the garage where it is currently stored into the shop is with a dolly and a couple of strong helpers. I looked at purchasing one but was put off by the price. Cheap ones with a 2x safety factor are around $300 and from their appearance do not seem up to the task. Really well-designed ones are almost twice that much. I decided to pick up a set of swivel casters rated for an 1100-pound load each ($60 for the set) and built the base out of left-over framing lumber. The wheels are 4 inches tall and 2 inches wide. I plan to use scrap sheets of OSB for a smooth surface over which to roll the loaded dolly. Only time will tell if this plan works out. Of one thing I am certain. This dolly will definitely stand up to the load.

Side Note: My shop is now largely operational. I used my miter saw, table saw, bandsaw, and planer in the construction of this project which features lap joints at the corners.