Fall Tomatoes for Texas?

[ArcherB]

My production has severely dropped off and some of my plants have stopped producing entirely. This will only get worse as the heat sets in. In previous years, I've left plants in the ground hoping to get a fall harvest, but I've never had any luck.

I was thinking of simply starting a new round of plants to replace the old ones. Has anyone ever tried to plant a second round of plants for a second harvest? Any luck?