I've used a skateboard for years to move heavy things- carry one in the work van always. It's less than ideal for sheet goods and doors, 'tho, so I came up with this. At first flat top with non-slip tape, now added beveled pieces to keep the sheet centered, and it's working well. Some kind of jumbo skate wheels- they roll over an extension cord. The bevel pieces cut from a redwood 2 by 4.