My understanding is that if you are installing Win 7 with MSAHCI or Intel drivers TRIM will work if you run a quick format before Window's is installed. You could do the same thing when installing an image.
I don't think it is advisable to run a full format, but clarity on that from Intel would be helpful.
Clarity on the benefits between preparing a drive in a previously used state with a secure erase or TRIM operation would also be helpful.
That is the key to your question. It's not so much about installing the image with TRIM functionality it's about prepping the drive first if it is in a used state, so you start from fresh.
The safe way to be 100% sure is to run a secure erase on the drive and then install the image. When you secure erase the drive is set back to factory fresh condition.
