My advise, and even to this day I contemplate doing this sometimes, is to start from scratch. Dont worry about a tailer, and 48" mower etc etc. Go get you an good 21 walk behind, 2 string trimmers, stick edger, blower of choice, and some basic hand tools. You would be amazed what you can do with just those few small things. Overhead is super low, and I bet you could knock out 8-10 yards a day.
Start from scratch and see where it leads you.
Me personally, I think about this just because I think it would be a fun challenge to see how low I could get my overhead and how much profit I could make all at the same time...I'm way past that stage in my biz, but I always think it would be cool to have minimal bills and high profits.