I use a 2" thick solid core door from a hospital room screwed to the top of a stack of waterbed under dressers. They are stacked three high (three per side). The whole thing sits on a sheet of 3/4 plywood with eight casters so I can move it around my shop as needed. Of course I have tools and supplies in the dresser drawers. You can find the under dressers at garage sales. Try it, youll like it!
Rob