For a 7am flight, you will most likely be given a pick-up time of about 4am!! Early, I know, but it is what it is.
You won't be able to check your bags at that time. As already mentioned, the RAC counter doesn't open until 5am, and your bags have to be all checked no less than 3 hrs. before flight departure..which would be 4am, at the latest....so, that's not going to happen.