Our house in Twin Mountain was built on a slope equal to a story of house.  On the backside of the house the lower level was exposed.  The design of our new garage, also on this slope, was an over/under design as a result.  The lower garage was smaller because I had the one side made into a 8' wide shop and storage room.  As I started to use the lower garage and shop to build furniture, I found that the shop was more a tool storage and small task shop.  For the furniture, I worked in the larger garage section.  

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I used saw horses to support my work when working in the garage, but I always seemed to be on the wrong side of the work.  I'd set up for one task and then have to move things around for the next task.  I needed what I was working on mounted on wheels.  I decided the easiest way to accomplish this was to build a 4' x 8' workbench mounted on casters.  I knew this bench would take a beating, so I made it to made it to withstand what I throw at it.  

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The frame of the workbench is made out of 2" x 4" lumber.  Each corner board is braced with a 45 degree support from top to board in both directions.  The lower shelf size is the full 4' x 8' and is made of a 3/4" finished plywood.  The top shelf is a double thickness of 3/4" finished plywood mounted on a 2" x 4" x 16" frame.  I used deck screws to assemble the work bench.  The casters I put on the bench were rated for 700# each.  Probably overkill, but I haven't had any problem with loading heavy boards on the bench and still being able to move it.