You can buy packs of furniture sliders at Harbor Freight for really cheap.
I bought two packs, put them under my 8 table legs, and left them there permanently.
I can slide my 10 x 5 layout table on the concrete floor by myself by just giving it long stead pushes or pulls.
Since your table is so long, your issue will be whether the structure of the table will flex and crack when pushing or pulling it.
If you put the sliders under the legs, and get four guys to evenly space along the outside of the length, and then have them give gentle "heave-ho" pulls, I think that you will have little problems moving it, assuming the legs are strong enough and are diagonally braced.
Mannyrock
