When I had a cabinet saw with an substantial outfeed table/bench I ended up using the saw top a lot as a work surface. When I changed to a Euro Slider I decided I needed more bench space and I decided a mobile bench would be the most flexible for me. I ended up building one that is about 6 ft long and 32" wide with 21 full extension drawers. It rides on Zambus leveling casters. Because I will also want to roll it out of the garage at times I went with much larger Zambus casters, 1000 lb rated ones, so I could get a larger diameter wheel to roll over the expansion joint between the garage and the driveway. The top is two layers of MDF with formica on top, edged with hard maple. The edging is held in place with glue and Miller Dowels so I can easily cut it off and replace it later.
Here is a pic of the large Zambus caster under the bench next to the 300 lb rated Zambus I used on most machines.