I have done a large king size quilt on my ten foot table. I started pinning on one side, went as far as I could, folded the fabric over, quilted the "good" side, then re-pinned moving it all over so I could get the "folded" side. It was a hassle, but I will likely do it again. Of course it was not for a customer, it was a gift I was making for a friend of the family. It did not show that I had kind of fudged things and the receivers were delighted with the result. I used a flat cotton batting. If I were to do so for a customer I would want them to understand the risks and maybe even sign a waiver first.