From your post it appears you would like to use a protective cover for your indeterminates as (autumn) first frost approaches. Around here we can sometimes get a few days of Sept frost, only to have autumn continue warm until late October.

For this reason I string-trellis my tomatoes with a hook knot atop; so that when risk of frost occurs I unfasten the vines and CAREFULLY place them on the ground wrapped in a sleeping bag until overnight frost clears. Then I place the strings back on their hooks. I know it sounds unorthodox and weird, but it works for me.