I am going to start a part-time lawn service in March and I was wondering if I can start with just a 21". I only own a car, so I am thinking about getting a 21", trimmer, blower and transport them in my car. Most of initial lawns I will get will be small, and I will obviously spend a lot of extra time mowing my first few larger lawns with a 21". Once I get 5 or more larger lawns I will buy a truck, something like http://www.cybcon.com/~jimlewis/ChevyTruck.html and a 48". I am not trying to get big fast, I am going to focus on getting accounts all next to each other. I will be perfectly happy if I only have 10 lawns for $250/week for the first few months, and 20 lawns for $600/week at the end of my first year.